List questions from recreational-mathematics

Published on 15 Apr 2026 - 20:58

1.3k

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Does other solutions exist for $29x+30y+31z = 366$?

Published on 12 Apr 2026 - 4:30

340

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The largest tile in 2048, groups of 3 variant?

Published on 12 Apr 2026 - 6:03

384

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Approximating $\pi$ by an expression of the form $\sqrt{\sqrt{ \cdots \sqrt{ n!! \cdots !}}}$

Published on 16 Apr 2026 - 4:30

177

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A set of cards from which I can identify and number $n$ with $1\le n\le N$

Published on 16 Apr 2026 - 8:25

15.8k

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How do people perform mental arithmetic for complicated expressions?

Published on 25 Mar 2026 - 22:23

72

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The answer is as expected, but this is not proportionality.

Published on 15 Apr 2026 - 19:52

152

Views

Triangle Area problem

Published on 12 Apr 2026 - 3:57

269

Views

A fashion victim puzzle

Published on 12 Apr 2026 - 2:41

647

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Proof of a discovery involving the square of whole numbers

Published on 11 Apr 2026 - 6:02

822

Views

Which numbers are square modulo 9?

Published on 13 Apr 2026 - 3:36

89

Views

Is there a formula for $1+\sqrt{2}+\sqrt{3}+\cdots+\sqrt{N}$?

Published on 15 Apr 2026 - 4:40

185

Views

Ghosts closing and opening doors

Published on 09 Apr 2026 - 8:09

38

Views

Predictability of what $\lfloor n\log n\rfloor$ "skips"

Published on 15 Apr 2026 - 5:10

64

Views

Expression as an integral

Published on 10 Apr 2026 - 2:33

List Question

Number of lines to connect $n \times n$ dots

Does other solutions exist for $29x+30y+31z = 366$?

The largest tile in 2048, groups of 3 variant?

Approximating $\pi$ by an expression of the form $\sqrt{\sqrt{ \cdots \sqrt{ n!! \cdots !}}}$

A set of cards from which I can identify and number $n$ with $1\le n\le N$

How do people perform mental arithmetic for complicated expressions?

The answer is as expected, but this is not proportionality.

Triangle Area problem

A fashion victim puzzle

Proof of a discovery involving the square of whole numbers

Which numbers are square modulo 9?

Is there a formula for $1+\sqrt{2}+\sqrt{3}+\cdots+\sqrt{N}$?

Ghosts closing and opening doors

Predictability of what $\lfloor n\log n\rfloor$ "skips"

Expression as an integral

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