List questions from recreational-mathematics

Published on 12 Apr 2026 - 13:54

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Something interesting that I found about some numbers - and would like to see if it's known

Published on 12 Apr 2026 - 7:24

240

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Optimal polyomino induced coloring

Published on 11 Apr 2026 - 22:06

173

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From a mathematical point of view is it optimal in no limit texas hold em to play with more money than less?

Published on 14 Apr 2026 - 10:07

152

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Number of knots possible with length L string

Published on 16 Apr 2026 - 1:56

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A binet-like formula for $\small 1 , 2 , 3 , 6 , 9 , 18 , 27, 54, 81, \ldots $?

Published on 16 Apr 2026 - 5:22

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Dot on forehead riddle

Published on 15 Apr 2026 - 21:40

572

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Find the angle between two lines using a compass and straight edge.

Published on 10 Apr 2026 - 21:44

260

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cyclic permutations of periods of recurring fractions

Published on 12 Apr 2026 - 13:55

2.2k

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Is the Collatz conjecture in $\Sigma_1 / \Pi_1$?

Published on 13 Apr 2026 - 1:16

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Tiling with polyominos

Published on 15 Apr 2026 - 3:28

278

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Density of black cells in rule 110

Published on 10 Apr 2026 - 2:16

233

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A game played on graphs by "flipping" the state of a vertex and its neighbors

Published on 16 Apr 2026 - 13:57

1.8k

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Coffee Break Riddle

Published on 13 Apr 2026 - 10:45

712

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Is there a real-valued function $f$ such that $f(f(x)) = -x$?

Published on 13 Apr 2026 - 17:29

List Question

How many fours are needed to represent numbers up to $N$?

Something interesting that I found about some numbers - and would like to see if it's known

Optimal polyomino induced coloring

From a mathematical point of view is it optimal in no limit texas hold em to play with more money than less?

Number of knots possible with length L string

A binet-like formula for $\small 1 , 2 , 3 , 6 , 9 , 18 , 27, 54, 81, \ldots $?

Dot on forehead riddle

Find the angle between two lines using a compass and straight edge.

cyclic permutations of periods of recurring fractions

Is the Collatz conjecture in $\Sigma_1 / \Pi_1$?

Tiling with polyominos

Density of black cells in rule 110

A game played on graphs by "flipping" the state of a vertex and its neighbors

Coffee Break Riddle

Is there a real-valued function $f$ such that $f(f(x)) = -x$?

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