List questions from recreational-mathematics

Published on 15 Apr 2026 - 13:43

2.1k

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Why are digits written in groups of three?

Published on 11 Apr 2026 - 16:14

84

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Coordinated motion of objects on a grid

Published on 14 Apr 2026 - 2:50

188

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Inverse Error function of $x$ if $x>1$

Published on 14 Apr 2026 - 22:46

126

Views

Rebuses based on mathematical formulas

Published on 13 Apr 2026 - 15:14

140

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Prove that $\sum\limits_{i=1}^{n} \frac{1}{x_i} < \frac{15}{8}$

Published on 15 Apr 2026 - 16:34

635

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Help me visualize a function with infinitely many logarithms of absolute values of logarithms

Published on 14 Apr 2026 - 5:46

298

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The mystik spiral(challenge)

Published on 08 Apr 2026 - 9:25

53

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Prove $\frac{x^a-1}{x-1}$ is an element of the whole number set

Published on 16 Apr 2026 - 10:46

126

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Search for the nth 3d pentagonal numbers(challenge)

Published on 16 Apr 2026 - 12:35

1.4k

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Count the number of fish caught in total if we are given the number of fishermen who caught at least $n$ fish.

Published on 16 Apr 2026 - 12:31

137

Views

Tiling a $4 \times 4$ square with two corners removed using $ 2\times 1$ tiles.

Published on 15 Apr 2026 - 11:45

2.7k

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Question on Concatenation of Prime Numbers

Published on 17 Apr 2026 - 1:27

724

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Convert a Pair of Integers to a Integer, Optimally?

Published on 15 Apr 2026 - 6:41

87

Views

Can a rectangle in the plane contain exactly 51 lattice points?

Published on 11 Apr 2026 - 9:42

List Question

Swapping hands in a generalized clock

Why are digits written in groups of three?

Coordinated motion of objects on a grid

Inverse Error function of $x$ if $x>1$

Rebuses based on mathematical formulas

Prove that $\sum\limits_{i=1}^{n} \frac{1}{x_i} < \frac{15}{8}$

Help me visualize a function with infinitely many logarithms of absolute values of logarithms

The mystik spiral(challenge)

Prove $\frac{x^a-1}{x-1}$ is an element of the whole number set

Search for the nth 3d pentagonal numbers(challenge)

Count the number of fish caught in total if we are given the number of fishermen who caught at least $n$ fish.

Tiling a $4 \times 4$ square with two corners removed using $ 2\times 1$ tiles.

Question on Concatenation of Prime Numbers

Convert a Pair of Integers to a Integer, Optimally?

Can a rectangle in the plane contain exactly 51 lattice points?

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