List questions from recreational-mathematics

Published on 15 Apr 2026 - 12:47

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Are all powers of 5 Friedman numbers?

Published on 10 Apr 2026 - 12:54

888

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3d parametric spiral to 3D goldean mean spiral

Published on 10 Apr 2026 - 3:32

149

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Proving the rules of a complicated game are well defined

Published on 25 Mar 2026 - 14:23

461

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In what system(s) of numeration is 11111 a perfect square?

Published on 14 Apr 2026 - 13:33

125

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$\sum_{n=1}^\infty \frac{1}{(n^2-1)!} - \sum_{n=1}^\infty \frac{1}{(7n+1)!}$ is almost $1+1/6$

Published on 15 Apr 2026 - 19:47

219

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Math trinom help

Published on 14 Apr 2026 - 9:51

125

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Number puzzle : "You can't determine my sum."

Published on 14 Apr 2026 - 18:02

1k

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The case of Captain America's shield: a variation of Alhazen's Billard problem

Published on 10 Apr 2026 - 16:38

1.3k

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Playing with propositional truth-tables

Published on 13 Apr 2026 - 0:15

1.1k

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Prove that 5 points lie on the same circle

Published on 15 Apr 2026 - 7:46

78

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Is there a heuristic reason behind this numerical coincidence?

Published on 25 Mar 2026 - 18:24

46

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How comes plotting affine curve as shadows of gray modulo integer resembles its real locus?

Published on 13 Apr 2026 - 5:37

255

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Are these lines going to meet in exactly 2002 points?

Published on 12 Apr 2026 - 10:04

291

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Trajectories on a circular billiards table

Published on 13 Apr 2026 - 2:16

List Question

Puzzles and topology

Are all powers of 5 Friedman numbers?

3d parametric spiral to 3D goldean mean spiral

Proving the rules of a complicated game are well defined

In what system(s) of numeration is 11111 a perfect square?

$\sum_{n=1}^\infty \frac{1}{(n^2-1)!} - \sum_{n=1}^\infty \frac{1}{(7n+1)!}$ is almost $1+1/6$

Math trinom help

Number puzzle : "You can't determine my sum."

The case of Captain America's shield: a variation of Alhazen's Billard problem

Playing with propositional truth-tables

Prove that 5 points lie on the same circle

Is there a heuristic reason behind this numerical coincidence?

How comes plotting affine curve as shadows of gray modulo integer resembles its real locus?

Are these lines going to meet in exactly 2002 points?

Trajectories on a circular billiards table

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