List questions from recreational-mathematics

Published on 09 Aug 2016 - 8:24

250

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Integer-valued Blanche Dissection of a Square

Published on 26 Mar 2026 - 12:52

3.3k

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Can 4 lines intersect in 2 points?

Published on 10 Aug 2016 - 0:50

60

Views

Sending $m$ bits of information using $n\geq m$ bits, with recipient not knowing which bits we used

Published on 30 Mar 2026 - 18:11

170

Views

How many strong simple addition mathagrams of degree one are there in a given base?

Published on 10 Aug 2016 - 15:58

219

Views

Too simple to prove?

Published on 12 Aug 2016 - 7:28

1.8k

Views

IMO 2016 Problem 5

Published on 12 Aug 2016 - 12:29

164

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Challenge: Prove $\displaystyle \sum_{n \in \mathbb{N}} \frac{n!}{(2n+1)!}=e^{1/4}\sqrt{\pi}\ \ \mathrm{erf}(\frac{1}{2})$

Published on 12 Aug 2016 - 14:29

102

Views

Transcendental Lonely Runner

Published on 12 Aug 2016 - 23:52

447

Views

Developing functional thinking.

Published on 30 Mar 2026 - 9:46

198

Views

A Game Played on Grids: Why Does the First Player Always Win?

Published on 14 Aug 2016 - 2:25

9.8k

Views

Question about logic riddle (patch of lily pads that doubles every day)

Published on 14 Aug 2016 - 21:11

31.1k

Views

Solving the 24 Game for 5, 5, 5 and 1

Published on 15 Aug 2016 - 21:35

671

Views

Flipping a coin to maximize ratio of heads

Published on 16 Aug 2016 - 2:20

149

Views

Can a rectangle be tiled with $6$ smaller rectangles, such that no smaller set of those rectangles forms a rectangle?

Published on 26 Mar 2026 - 7:33

List Question

Regular pentagon in a square

Integer-valued Blanche Dissection of a Square

Can 4 lines intersect in 2 points?

Sending $m$ bits of information using $n\geq m$ bits, with recipient not knowing which bits we used

How many strong simple addition mathagrams of degree one are there in a given base?

Too simple to prove?

IMO 2016 Problem 5

Challenge: Prove $\displaystyle \sum_{n \in \mathbb{N}} \frac{n!}{(2n+1)!}=e^{1/4}\sqrt{\pi}\ \ \mathrm{erf}(\frac{1}{2})$

Transcendental Lonely Runner

Developing functional thinking.

A Game Played on Grids: Why Does the First Player Always Win?

Question about logic riddle (patch of lily pads that doubles every day)

Solving the 24 Game for 5, 5, 5 and 1

Flipping a coin to maximize ratio of heads

Can a rectangle be tiled with $6$ smaller rectangles, such that no smaller set of those rectangles forms a rectangle?

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