List questions from recreational-mathematics

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"Multi-facets" rope puzzle

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Looking for an equation

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Differing by $2$ "puzzle"

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Rotating the graph of a function

Published on 14 Apr 2026 - 11:22

181

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Finite groups, where the number of subgroups is equal to the number of elements

Published on 15 Apr 2026 - 10:15

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How do I find the center of a circle on a rectangular piece of paper?

Published on 11 Apr 2026 - 5:47

136

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How Much Should I Make?

Published on 09 Apr 2026 - 10:12

374

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What hexahedra have faces with areas of exactly 1, 2, 3, 4, 5, and 6 units?

Published on 15 Apr 2026 - 12:00

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Mathematics of Tetris 2.0

Published on 13 Apr 2026 - 18:39

164

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Unique representation of reals by (infinite) application of the (+,-,/,*,^) operations to elements of $\mathbb Q$?

Published on 16 Apr 2026 - 5:41

215

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For which positive integers n does there exist a prime whose digits sum to n?

Published on 12 Apr 2026 - 9:17

113

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Solve for $x$ in this equation

Published on 12 Apr 2026 - 8:07

173

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Tilting sealed drums for fun

Published on 13 Apr 2026 - 14:38

1.5k

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An interesting problem of tossing a fair die successively

Published on 11 Apr 2026 - 14:45

List Question

Find Volume of a Wineglass - a Slice

"Multi-facets" rope puzzle

Looking for an equation

Differing by $2$ "puzzle"

Rotating the graph of a function

Finite groups, where the number of subgroups is equal to the number of elements

How do I find the center of a circle on a rectangular piece of paper?

How Much Should I Make?

What hexahedra have faces with areas of exactly 1, 2, 3, 4, 5, and 6 units?

Mathematics of Tetris 2.0

Unique representation of reals by (infinite) application of the (+,-,/,*,^) operations to elements of $\mathbb Q$?

For which positive integers n does there exist a prime whose digits sum to n?

Solve for $x$ in this equation

Tilting sealed drums for fun

An interesting problem of tossing a fair die successively

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