List questions from recreational-mathematics

Published on 12 Apr 2026 - 14:58

214

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Rubik's Cube Question

Published on 15 Apr 2026 - 6:59

237

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Measuring how change in input variables contributes to output in non linear equation.

Published on 16 Apr 2026 - 23:08

80

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Given $a, b, c, d, m \in\mathbb{Z}$such that $5\mid (am^3 + bm^2 + cm + d)$, prove that there exists integer $n$ such that...

Published on 16 Apr 2026 - 3:54

23.1k

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Are there more even numbers than odd numbers?

Published on 11 Apr 2026 - 23:13

148

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Define S as a set of primes such that if a, b are in S, ab+4 is in S. Show that S must be empty.

Published on 14 Apr 2026 - 18:19

402

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Relative Percentage vs Percentage Change

Published on 11 Apr 2026 - 1:19

4.3k

Views

What is the parity of permutation in the 15 puzzle?

Published on 14 Apr 2026 - 2:42

22.2k

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Sum of cubes of the digits of a number equal to the number

Published on 14 Apr 2026 - 17:23

3.6k

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Clock striking problem

Published on 10 Apr 2026 - 18:39

1.3k

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Striking off a digit from each of the numbers written in seven rows, while preserving arithmetical operations

Published on 14 Apr 2026 - 16:15

157

Views

Playing around with ${\int\frac{dx}{x^2-2x}}$

Published on 15 Apr 2026 - 21:50

4.4k

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$12345679$ and friends

Published on 16 Apr 2026 - 6:53

155

Views

How many ways can you ascend a stairway of any number of steps?

Published on 14 Apr 2026 - 7:24

79

Views

Sorting $N$-ary Gray codes into a plane/grid

Published on 13 Apr 2026 - 23:03

List Question

How to draw by hand mathematical figures?

Rubik's Cube Question

Measuring how change in input variables contributes to output in non linear equation.

Given $a, b, c, d, m \in\mathbb{Z}$such that $5\mid (am^3 + bm^2 + cm + d)$, prove that there exists integer $n$ such that...

Are there more even numbers than odd numbers?

Define S as a set of primes such that if a, b are in S, ab+4 is in S. Show that S must be empty.

Relative Percentage vs Percentage Change

What is the parity of permutation in the 15 puzzle?

Sum of cubes of the digits of a number equal to the number

Clock striking problem

Striking off a digit from each of the numbers written in seven rows, while preserving arithmetical operations

Playing around with ${\int\frac{dx}{x^2-2x}}$

$12345679$ and friends

How many ways can you ascend a stairway of any number of steps?

Sorting $N$-ary Gray codes into a plane/grid

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