List questions from recreational-mathematics

Published on 14 Apr 2026 - 22:03

107

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A BDMO functional equation problem.

Published on 22 Apr 2026 - 2:22

654

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Can we find sums for $\int_1^{\infty }e^{\pi i t} \left(t^{1/t}-1\right) \, dt?$

Published on 16 Apr 2026 - 6:13

221

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Evaluation of $\sum\limits_{n=1}^\infty \frac{(-1)^n\text{Ei}(n)}{n!}$

Published on 13 Apr 2026 - 23:05

271

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What are the chances of losing a game of hangman?

Published on 11 Apr 2026 - 2:20

213

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Rigid nonagons and rational solutions of a hyperelliptic equation

Published on 06 May 2026 - 3:17

404

Views

A way to express 100 by using the first four natural numbers

Published on 09 Apr 2026 - 13:06

96

Views

What are non-trivial dissections of a $45^\circ-60^\circ-75^\circ$ triangle into smaller $45^\circ-60^\circ-75^\circ$ triangles?

Published on 16 Apr 2026 - 16:39

142

Views

On the evaluation of $\sum\limits_3^\infty \frac1{\ln\Gamma(n)}$

Published on 16 Apr 2026 - 2:00

199

Views

Edgematching tiles

Published on 15 Apr 2026 - 3:03

298

Views

How many bishops can be placed on a $m \times n$ chessboard?

Published on 15 Apr 2026 - 21:40

592

Views

How to check if a number is within a range without $<$, $>$?

Published on 09 Apr 2026 - 14:47

43

Views

An open problem concerns primorials plus one having square factors. What about primorials squared plus one?

Published on 11 May 2026 - 9:30

3.2k

Views

Intriguing moves with the $3\times3\times3$ Rubiks cube

Published on 13 Apr 2026 - 7:07

43

Views

Counting distinct number of elements

Published on 16 Apr 2026 - 3:56

List Question

Determining sufficient area of a 2D annulus such that it can fit 48 circles each with radius of 35

A BDMO functional equation problem.

Can we find sums for $\int_1^{\infty }e^{\pi i t} \left(t^{1/t}-1\right) \, dt?$

Evaluation of $\sum\limits_{n=1}^\infty \frac{(-1)^n\text{Ei}(n)}{n!}$

What are the chances of losing a game of hangman?

Rigid nonagons and rational solutions of a hyperelliptic equation

A way to express 100 by using the first four natural numbers

What are non-trivial dissections of a $45^\circ-60^\circ-75^\circ$ triangle into smaller $45^\circ-60^\circ-75^\circ$ triangles?

On the evaluation of $\sum\limits_3^\infty \frac1{\ln\Gamma(n)}$

Edgematching tiles

How many bishops can be placed on a $m \times n$ chessboard?

How to check if a number is within a range without $<$, $>$?

An open problem concerns primorials plus one having square factors. What about primorials squared plus one?

Intriguing moves with the $3\times3\times3$ Rubiks cube

Counting distinct number of elements

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