| # | Problem |
Clojure |
Erlang |
Ruby |
Scala |
| 1 |
Add all the natural numbers below one thousand that are multiples of 3 or 5. |
1.54
|
0.198
|
0.01
|
0.24
|
| 2 |
Find the sum of all the even-valued terms in the Fibonacci sequence which do not exceed four million. |
1.61
|
0.417
|
0.02
|
0.21
|
| 3 |
Find the largest prime factor of a composite number. |
-
|
0.14
|
0.03
|
0.26
|
| 4 |
Find the largest palindrome made from the product of two 3-digit numbers. |
6.04
|
0.52
|
3.64
|
1.35
|
| 5 |
What is the smallest number divisible by each of the numbers 1 to 20? |
-
|
0.12
|
0.02
|
-
|
| 6 |
What is the difference between the sum of the squares and the square of the sums? |
1.76
|
0.14
|
0.02
|
0.18
|
| 7 |
Find the 10001<sup>st</sup> prime. |
-
|
0.56
|
0.98
|
0.51
|
| 8 |
Discover the largest product of five consecutive digits in the 1000-digit number. |
-
|
0.12
|
0.05
|
0.33
|
| 9 |
Find the only Pythagorean triplet, {<var>a</var>, <var>b</var>, <var>c</var>}, for which <var>a</var> + <var>b</var> + <var>c</var> = 1000. |
-
|
0.473
|
0.338
|
0.5
|
| 10 |
Calculate the sum of all the primes below two million. |
-
|
10.45
|
28.48
|
0.86
|
| 11 |
What is the greatest product of four numbers on the same straight line in the 20 by 20 grid? |
-
|
0.12
|
0.0
|
0.25
|
| 12 |
What is the value of the first triangle number to have over five hundred divisors? |
-
|
9.57
|
4.56
|
0.52
|
| 13 |
Find the first ten digits of the sum of one-hundred 50-digit numbers. |
-
|
0.433
|
0.02
|
-
|
| 14 |
Find the longest sequence using a starting number under one million. |
-
|
7.133
|
13.64
|
-
|
| 15 |
Starting in the top left corner in a 20 by 20 grid, how many routes are there to the bottom right corner? |
-
|
0.11
|
0.02
|
-
|
| 16 |
What is the sum of the digits of the number 2<sup>1000</sup>? |
1.56
|
0.12
|
0.02
|
0.22
|
| 17 |
How many letters would be needed to write all the numbers in words from 1 to 1000? |
-
|
0.203
|
0.04
|
-
|
| 18 |
Find the maximum sum travelling from the top of the triangle to the base. |
-
|
0.21
|
0.02
|
-
|
| 19 |
How many Sundays fell on the first of the month during the twentieth century? |
-
|
0.205
|
0.021
|
-
|
| 20 |
Find the sum of digits in 100! |
1.62
|
0.12
|
0.01
|
0.19
|
| 21 |
Evaluate the sum of all amicable pairs under 10000. |
-
|
4.66
|
3.51
|
-
|
| 22 |
What is the total of all the name scores in the file of first names? |
-
|
0.278
|
0.12
|
-
|
| 23 |
Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers. |
-
|
18.0
|
9.45
|
-
|
| 24 |
What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9? |
-
|
0.08
|
0.0
|
-
|
| 25 |
What is the first term in the Fibonacci sequence to contain 1000 digits? |
3.58
|
0.13
|
0.032
|
-
|
| 26 |
Find the value of <i>d</i> < 1000 for which 1/<i>d</i> contains the longest recurring cycle. |
-
|
-
|
-
|
-
|
| 27 |
Find a quadratic formula that produces the maximum number of primes for consecutive values of <i>n</i>. |
-
|
4.62
|
7.23
|
-
|
| 28 |
What is the sum of both diagonals in a 1001 by 1001 spiral? |
-
|
0.204
|
0.03
|
-
|
| 29 |
How many distinct terms are in the sequence generated by <i>a<sup>b</sup></i> for 2 ≤ <i>a</i> ≤ 100 and 2 ≤ <i>b</i> ≤ 100? |
3.37
|
0.2
|
0.08
|
-
|
| 30 |
Find the sum of all the numbers that can be written as the sum of fifth powers of their digits. |
-
|
1.56
|
6.82
|
-
|
| 31 |
Investigating combinations of English currency denominations. |
-
|
7.165
|
0.372
|
-
|
| 32 |
Find the sum of all numbers that can be written as pandigital products. |
-
|
3.58
|
0.98
|
-
|
| 33 |
Discover all the fractions with an unorthodox cancelling method. |
-
|
-
|
0.12
|
-
|
| 34 |
Find the sum of all numbers which are equal to the sum of the factorial of their digits. |
-
|
-
|
0.78
|
-
|
| 35 |
How many circular primes are there below one million? |
-
|
9.1
|
6.46
|
-
|
| 36 |
Find the sum of all numbers less than one million, which are palindromic in base 10 and base 2. |
5.29
|
0.62
|
2.06
|
-
|
| 37 |
Find the sum of all eleven primes that are both truncatable from left to right and right to left. |
-
|
-
|
0.1
|
-
|
| 38 |
What is the largest 1 to 9 pandigital that can be formed by multiplying a fixed number by 1, 2, 3, ... ? |
-
|
-
|
0.221
|
-
|
| 39 |
If <i>p</i> is the perimeter of a right angle triangle, {<i>a</i>, <i>b</i>, <i>c</i>}, which value, for <i>p</i> ≤ 1000, has the most solutions? |
-
|
-
|
0.471
|
-
|
| 40 |
Finding the <i>n</i><sup>th</sup> digit of the fractional part of the irrational number. |
-
|
-
|
0.438
|
-
|
| 41 |
What is the largest <i>n</i>-digit pandigital prime that exists? |
-
|
-
|
1.09
|
-
|
| 42 |
How many triangle words does the list of common English words contain? |
-
|
0.13
|
0.05
|
-
|
| 43 |
Find the sum of all pandigital numbers with an unusual sub-string divisibility property. |
-
|
0.1
|
0.02
|
-
|
| 44 |
Find the smallest pair of pentagonal numbers whose sum and difference is pentagonal. |
-
|
-
|
45.97
|
-
|
| 45 |
After 40755, what is the next triangle number that is also pentagonal and hexagonal? |
-
|
-
|
2.05
|
-
|
| 46 |
What is the smallest odd composite that cannot be written as the sum of a prime and twice a square? |
-
|
-
|
0.93
|
-
|
| 47 |
Find the first four consecutive integers to have four distinct primes factors. |
-
|
37.73
|
19.79
|
-
|
| 48 |
Find the last ten digits of 1<sup>1</sup> + 2<sup>2</sup> + ... + 1000<sup>1000</sup>. |
2.08
|
0.13
|
0.0
|
-
|
| 49 |
Find arithmetic sequences, made of prime terms, whose four digits are permutations of each other. |
-
|
-
|
0.0
|
-
|
| 50 |
Which prime, below one-million, can be written as the sum of the most consecutive primes? |
-
|
8.65
|
0.67
|
-
|
| 51 |
Find the smallest prime which, by changing the same part of the number, can form eight different primes. |
-
|
-
|
-
|
-
|
| 52 |
Find the smallest positive integer, <i>x</i>, such that 2<i>x</i>, 3<i>x</i>, 4<i>x</i>, 5<i>x</i>, and 6<i>x</i>, contain the same digits in some order. |
-
|
2.79
|
4.32
|
-
|
| 53 |
How many values of C(<i>n</i>,<i>r</i>), for 1 ≤ <i>n</i> ≤ 100, exceed one-million? |
-
|
0.19
|
0.25
|
-
|
| 54 |
How many hands did player one win in the game of poker? |
-
|
-
|
0.13
|
-
|
| 55 |
How many Lychrel numbers are there below ten-thousand? |
-
|
0.54
|
0.2
|
-
|
| 56 |
Considering natural numbers of the form, <i>a<sup>b</sup></i>, finding the maximum digital sum. |
5.47
|
0.38
|
2.18
|
-
|
| 57 |
Investigate the expansion of the continued fraction for the square root of two. |
-
|
-
|
3.66
|
-
|
| 58 |
Investigate the number of primes that lie on the diagonals of the spiral grid. |
-
|
9.78
|
42.71
|
-
|
| 59 |
Using a brute force attack, can you decrypt the cipher using XOR encryption? |
-
|
-
|
-
|
-
|
| 60 |
Find a set of five primes for which any two primes concatenate to produce another prime. |
-
|
-
|
-
|
-
|
| 61 |
Find the sum of the only set of six 4-digit figurate numbers with a cyclic property. |
-
|
-
|
1.28
|
-
|
| 62 |
Find the smallest cube for which exactly five permutations of its digits are cube. |
-
|
0.2
|
0.31
|
-
|
| 63 |
How many <i>n</i>-digit positive integers exist which are also an <i>n</i><sup>th</sup> power? |
-
|
-
|
0.023
|
-
|
| 64 |
How many continued fractions for <i>N</i> ≤ 10000 have an odd period? |
-
|
-
|
-
|
-
|
| 65 |
Find the sum of digits in the numerator of the 100<sup>th</sup> convergent of the continued fraction for <i>e</i>. |
-
|
-
|
0.04
|
-
|
| 66 |
Investigate the Diophantine equation <i>x</i><sup>2</sup> − D<i>y</i><sup>2</sup> = 1. |
-
|
-
|
-
|
-
|
| 67 |
Using an efficient algorithm find the maximal sum in the triangle? |
-
|
0.476
|
0.061
|
-
|
| 68 |
What is the maximum 16-digit string for a "magic" 5-gon ring? |
-
|
-
|
-
|
-
|
| 69 |
Find the value of <i>n</i> ≤ 1,000,000 for which <i>n</i>/φ(<i>n</i>) is a maximum. |
-
|
0.14
|
-
|
-
|
| 70 |
Investigate values of <var>n</var> for which φ(<var>n</var>) is a permutation of <var>n</var>. |
-
|
-
|
-
|
-
|
| 71 |
Listing reduced proper fractions in ascending order of size. |
-
|
-
|
41.44
|
-
|
| 72 |
How many elements would be contained in the set of reduced proper fractions for <i>d</i> ≤ 1,000,000? |
-
|
28.71
|
-
|
-
|
| 73 |
How many fractions lie between 1/3 and 1/2 in a sorted set of reduced proper fractions? |
-
|
-
|
47.35
|
-
|
| 74 |
Determine the number of factorial chains that contain exactly sixty non-repeating terms. |
-
|
12.94
|
-
|
-
|
| 75 |
Find the number of different lengths of wire can that can form a right angle triangle in only one way. |
-
|
-
|
-
|
-
|
| 76 |
How many different ways can one hundred be written as a sum of at least two positive integers? |
-
|
-
|
-
|
-
|
| 77 |
What is the first value which can be written as the sum of primes in over five thousand different ways? |
-
|
-
|
-
|
-
|
| 78 |
Investigating the number of ways in which coins can be separated into piles. |
-
|
-
|
-
|
-
|
| 79 |
By analysing a user's login attempts, can you determine the secret numeric passcode? |
-
|
-
|
-
|
-
|
| 80 |
Calculating the digital sum of the decimal digits of irrational square roots. |
-
|
-
|
2.4
|
-
|
| 81 |
Find the minimal path sum from the top left to the bottom right by moving right and down. |
-
|
-
|
-
|
-
|
| 82 |
Find the minimal path sum from the left column to the right column. |
-
|
-
|
-
|
-
|
| 83 |
Find the minimal path sum from the top left to the bottom right by moving left, right, up, and down. |
-
|
-
|
-
|
-
|
| 84 |
In the game, Monopoly, find the three most popular squares when using two 4-sided dice. |
-
|
-
|
-
|
-
|
| 85 |
Investigating the number of rectangles in a rectangular grid. |
-
|
-
|
-
|
-
|
| 86 |
Exploring the shortest path from one corner of a cuboid to another. |
-
|
-
|
-
|
-
|
| 87 |
Investigating numbers that can be expressed as the sum of a prime square, cube, and fourth power? |
-
|
4.08
|
-
|
-
|
| 88 |
Exploring minimal product-sum numbers for sets of different sizes. |
-
|
-
|
-
|
-
|
| 89 |
Develop a method to express Roman numerals in minimal form. |
-
|
-
|
-
|
-
|
| 90 |
An unexpected way of using two cubes to make a square. |
-
|
-
|
-
|
-
|
| 91 |
Find the number of right angle triangles in the quadrant. |
-
|
23.664
|
-
|
-
|
| 92 |
Investigating a square digits number chain with a surprising property. |
-
|
-
|
0.76
|
-
|
| 93 |
Using four distinct digits and the rules of arithmetic, find the longest sequence of target numbers. |
-
|
-
|
-
|
-
|
| 94 |
Investigating almost equilateral triangles with integral sides and area. |
-
|
-
|
-
|
-
|
| 95 |
Find the smallest member of the longest amicable chain with no element exceeding one million. |
-
|
-
|
-
|
-
|
| 96 |
Devise an algorithm for solving Su Doku puzzles. |
-
|
-
|
2.49
|
-
|
| 97 |
Find the last ten digits of the non-Mersenne prime: 28433 × 2<sup>7830457</sup> + 1. |
1.63
|
0.241
|
0.02
|
-
|
| 98 |
Investigating words, and their anagrams, which can represent square numbers. |
-
|
-
|
-
|
-
|
| 99 |
Which base/exponent pair in the file has the greatest numerical value? |
-
|
0.222
|
0.035
|
-
|
| 100 |
Finding the number of blue discs for which there is 50% chance of taking two blue. |
-
|
-
|
-
|
-
|
| 101 |
Investigate the optimum polynomial function to model the first <i>k</i> terms of a given sequence. |
-
|
-
|
-
|
-
|
| 102 |
For how many triangles in the text file does the interior contain the origin? |
-
|
-
|
-
|
-
|
| 103 |
Investigating sets with a special subset sum property. |
-
|
-
|
-
|
-
|
| 104 |
Finding Fibonacci numbers for which the first and last nine digits are pandigital. |
-
|
67.756
|
-
|
-
|
| 105 |
Find the sum of the special sum sets in the file. |
-
|
-
|
-
|
-
|
| 106 |
Find the minimum number of comparisons needed to identify special sum sets. |
-
|
-
|
-
|
-
|
| 107 |
Determining the most efficient way to connect the network. |
-
|
-
|
-
|
-
|
| 108 |
Solving the Diophantine equation 1/<var>x</var> + 1/<var>y</var> = 1/<var>n</var>. |
-
|
-
|
-
|
-
|
| 109 |
How many distinct ways can a player checkout in the game of darts with a score of less than 100? |
-
|
-
|
-
|
-
|
| 110 |
Find an efficient algorithm to analyse the number of solutions of the equation 1/<var>x</var> + 1/<var>y</var> = 1/<var>n</var>. |
-
|
-
|
-
|
-
|
| 111 |
Search for 10-digit primes containing the maximum number of repeated digits. |
-
|
-
|
-
|
-
|
| 112 |
Investigating the density of "bouncy" numbers. |
-
|
8.078
|
-
|
-
|
| 113 |
How many numbers below a googol (10<sup>100</sup>) are not "bouncy"? |
-
|
-
|
-
|
-
|
| 114 |
Investigating the number of ways to fill a row with separated blocks that are at least three units long. |
-
|
-
|
-
|
-
|
| 115 |
Finding a generalisation for the number of ways to fill a row with separated blocks. |
-
|
-
|
-
|
-
|
| 116 |
Investigating the number of ways of replacing square tiles with one of three coloured tiles. |
-
|
-
|
0.039
|
-
|
| 117 |
Investigating the number of ways of tiling a row using different-sized tiles. |
-
|
-
|
0.031
|
-
|
| 118 |
Exploring the number of ways in which sets containing prime elements can be made. |
-
|
-
|
-
|
-
|
| 119 |
Investigating the numbers which are equal to sum of their digits raised to some power. |
-
|
-
|
-
|
-
|
| 120 |
Finding the maximum remainder when (<i>a</i> − 1)<sup><i>n</i></sup> + (<i>a</i> + 1)<sup><i>n</i></sup> is divided by <i>a</i><sup>2</sup>. |
-
|
-
|
-
|
-
|
| 121 |
Investigate the game of chance involving coloured discs. |
-
|
-
|
-
|
-
|
| 122 |
Finding the most efficient exponentiation method. |
-
|
-
|
-
|
-
|
| 123 |
Determining the remainder when (<i>p<sub>n</sub></i> − 1)<sup><i>n</i></sup> + (<i>p<sub>n</sub></i> + 1)<sup><i>n</i></sup> is divided by <i>p<sub>n</sub></i><sup>2</sup>. |
-
|
-
|
-
|
-
|
| 124 |
Determining the <i>k</i><sup>th</sup> element of the sorted radical function. |
-
|
-
|
15.94
|
-
|
| 125 |
Finding square sums that are palindromic. |
-
|
-
|
1.24
|
-
|
| 126 |
Exploring the number of cubes required to cover every visible face on a cuboid. |
-
|
-
|
-
|
-
|
| 127 |
Investigating the number of <i>abc-hits</i> below a given limit. |
-
|
-
|
-
|
-
|
| 128 |
Which tiles in the hexagonal arrangement have prime differences with neighbours? |
-
|
-
|
-
|
-
|
| 129 |
Investigating minimal repunits that divide by <i>n</i>. |
-
|
-
|
-
|
-
|
| 130 |
Finding composite values, <i>n</i>, for which <i>n</i>−1 is divisible by the length of the smallest repunits that divide it. |
-
|
-
|
-
|
-
|
| 131 |
Determining primes, <i>p</i>, for which <i>n</i><sup>3</sup> + <i>n</i><sup>2</sup><i>p</i> is a perfect cube. |
-
|
-
|
-
|
-
|
| 132 |
Determining the first forty prime factors of a very large repunit. |
-
|
-
|
-
|
-
|
| 133 |
Investigating which primes will never divide a repunit containing 10<sup><i>n</i></sup> digits. |
-
|
-
|
-
|
-
|
| 134 |
Finding the smallest positive integer related to any pair of consecutive primes. |
-
|
-
|
-
|
-
|
| 135 |
Determining the number of solutions of the equation <i>x</i><sup>2</sup> − <i>y</i><sup>2</sup> − <i>z</i><sup>2</sup> = <i>n</i>. |
-
|
-
|
-
|
-
|
| 136 |
Discover when the equation <i>x</i><sup>2</sup> − <i>y</i><sup>2</sup> − <i>z</i><sup>2</sup> = <i>n</i> has a unique solution. |
-
|
-
|
-
|
-
|
| 137 |
Determining the value of infinite polynomial series for which the coefficients are Fibonacci numbers. |
-
|
-
|
-
|
-
|
| 138 |
Investigating isosceles triangle for which the height and base length differ by one. |
-
|
-
|
-
|
-
|
| 139 |
Finding Pythagorean triangles which allow the square on the hypotenuse square to be tiled. |
-
|
-
|
-
|
-
|
| 140 |
Investigating the value of infinite polynomial series for which the coefficients are a linear second order recurrence relation. |
-
|
-
|
-
|
-
|
| 141 |
Investigating progressive numbers, <i>n</i>, which are also square. |
-
|
-
|
-
|
-
|
| 142 |
Perfect Square Collection |
-
|
-
|
-
|
-
|
| 143 |
Investigating the Torricelli point of a triangle |
-
|
-
|
-
|
-
|
| 144 |
Investigating multiple reflections of a laser beam. |
-
|
-
|
-
|
-
|
| 145 |
How many reversible numbers are there below one-billion? |
-
|
-
|
-
|
-
|
| 146 |
Investigating a Prime Pattern |
-
|
-
|
-
|
-
|
| 147 |
Rectangles in cross-hatched grids |
-
|
-
|
-
|
-
|
| 148 |
Exploring Pascal's triangle. |
-
|
-
|
-
|
-
|
| 149 |
Searching for a maximum-sum subsequence. |
-
|
-
|
-
|
-
|
| 150 |
Searching a triangular array for a sub-triangle having minimum-sum. |
-
|
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| 151 |
Paper sheets of standard sizes: an expected-value problem. |
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| 152 |
Writing 1/2 as a sum of inverse squares |
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| 153 |
Investigating Gaussian Integers |
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| 154 |
Exploring Pascal's pyramid. |
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| 155 |
Counting Capacitor Circuits. |
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| 156 |
Counting Digits |
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| 157 |
Solving the diophantine equation <sup>1</sup>/<sub><var>a</var></sub>+<sup>1</sup>/<sub><var>b</var></sub>= <sup><var>p</var></sup>/<sub>10<sup><var>n</var></sup></sub> |
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| 158 |
Exploring strings for which only one character comes lexicographically after its neighbour to the left. |
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| 159 |
Digital root sums of factorisations. |
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| 160 |
Factorial trailing digits |
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| 161 |
Triominoes |
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| 162 |
Hexadecimal numbers |
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0.428
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0.02
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| 163 |
Cross-hatched triangles |
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| 164 |
Numbers for which no three consecutive digits have a sum greater than a given value. |
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| 165 |
Intersections |
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| 166 |
Criss Cross |
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| 167 |
Investigating Ulam sequences |
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| 168 |
Number Rotations |
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| 169 |
Exploring the number of different ways a number can be expressed as a sum of powers of 2. |
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| 170 |
Find the largest 0 to 9 pandigital that can be formed by concatenating products. |
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| 171 |
Finding numbers for which the sum of the squares of the digits is a square. |
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| 172 |
Investigating numbers with few repeated digits. |
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| 173 |
Using up to one million tiles how many different "hollow" square laminae can be formed? |
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| 174 |
Counting the number of "hollow" square laminae that can form one, two, three, ... distinct arrangements. |
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| 175 |
Fractions involving the number of different ways a number can be expressed as a sum of powers of 2. |
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| 176 |
Rectangular triangles that share a cathetus. |
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| 177 |
Integer angled Quadrilaterals. |
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| 178 |
Step Numbers |
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| 179 |
Consecutive positive divisors |
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| 180 |
Rational zeros of a function of three variables. |
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| 181 |
Investigating in how many ways objects of two different colours can be grouped. |
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| 182 |
RSA encryption |
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| 183 |
Maximum product of parts |
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| 184 |
Triangles containing the origin. |
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| 185 |
Number Mind |
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| 186 |
Connectedness of a network. |
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| 187 |
Semiprimes |
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| 188 |
The hyperexponentiation of a number |
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| 189 |
Tri-colouring a triangular grid |
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| 190 |
Maximising a weighted product |
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| 191 |
Prize Strings |
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| 192 |
Best Approximations |
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| 193 |
Squarefree Numbers |
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| 194 |
Coloured Configurations |
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| 195 |
Inscribed circles of triangles with one angle of 60 degrees |
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| 196 |
Prime triplets |
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| 197 |
Investigating the behaviour of a recursively defined sequence |
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| 198 |
Ambiguous Numbers |
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| 199 |
Iterative Circle Packing |
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| 200 |
Find the 200th prime-proof sqube containing the contiguous sub-string "200" |
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| 201 |
Subsets with a unique sum |
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| 202 |
Laserbeam |
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| 203 |
Squarefree Binomial Coefficients |
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| 204 |
Generalised Hamming Numbers |
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4.476
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| 205 |
Dice Game |
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2.722
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| 206 |
Concealed Square |
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| 207 |
Integer partition equations |
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| 208 |
Robot Walks |
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| 209 |
Circular Logic |
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| 210 |
Obtuse Angled Triangles |
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| 211 |
Divisor Square Sum |
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| 212 |
Combined Volume of Cuboids |
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| 213 |
Flea Circus |
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| 214 |
Totient Chains |
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| 215 |
Crack-free Walls |
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| 216 |
Investigating the primality of numbers of the form 2<var>n</var><sup>2</sup>-1 |
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| 217 |
Balanced Numbers |
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| 218 |
Perfect right-angled triangles |
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| 219 |
Skew-cost coding |
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| 220 |
Heighway Dragon |
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| 221 |
Alexandrian Integers |
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| 222 |
Sphere Packing |
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| 223 |
Almost right-angled triangles I |
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| 224 |
Almost right-angled triangles II |
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| 225 |
Tribonacci non-divisors |
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| 226 |
A Scoop of Blancmange |
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| 227 |
The Chase |
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| 228 |
Minkowski Sums |
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| 229 |
Four Representations using Squares |
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| 230 |
Fibonacci Words |
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| 231 |
The prime factorisation of binomial coefficients |
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| 232 |
The Race |
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| 233 |
Lattice points on a circle |
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| 234 |
Semidivisible numbers |
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| 235 |
An Arithmetic Geometric sequence |
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| 236 |
Luxury Hampers |
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| 237 |
Tours on a 4 x n playing board |
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|
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| 238 |
Infinite string tour |
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|
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|
| 239 |
Twenty-two Foolish Primes |
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|
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|
| 240 |
Top Dice |
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|
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|
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|
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|
| 241 |
Perfection Quotients |
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|
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|
| 242 |
Odd Triplets |
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|
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|
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|
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|
| 243 |
Resilience |
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|
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|
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|
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|
| 244 |
Sliders |
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|
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|
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|
-
|
| 245 |
Coresilience |
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|
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|
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|
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|
| 246 |
Tangents to an ellipse |
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|
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|
-
|
| 247 |
Squares under a hyperbola |
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|
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|
-
|
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|
| 248 |
Numbers for which Euler’s totient function equals 13! |
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|
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|
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|
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|
| 249 |
Prime Subset Sums |
-
|
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|
-
|
-
|
| 250 |
250250 |
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|
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|
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|
| 251 |
Cardano Triplets |
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|
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|
| 252 |
Convex Holes |
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|