List questions from recreational-mathematics

Published on 16 Apr 2026 - 1:05

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A problem about Sindel sequences and the Prague clock

Published on 12 Apr 2026 - 4:31

302

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Set $S$ of integers $\ge0$ such that $\{1,2,\cdots,n\}$ partitions into $A, B$ with $\sum_\limits{a\in A}a^k=\sum_\limits{b\in B}b^k$ for all $k\in S$

Published on 17 Apr 2026 - 18:52

75

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How to find focus and directrix of $4y = x^2 -16$

Published on 05 May 2026 - 0:44

82

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Sum of squares and the linear sum

Published on 11 Apr 2026 - 4:42

551

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Just using $+$ ,$-$, $\times$ using any given n-1 integers, can we make a number divisible by n? (NO bracket allowed!!)

Published on 11 Apr 2026 - 19:32

61

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Alternative way of expressing a quantied statement with "Some"

Published on 02 Apr 2026 - 4:06

617

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$\lim\limits_{N\to\infty}\sum\limits_{n=1}^{2N}(-1)^ng(n)=ℑ\lim\limits_{N\to\infty}\int\limits_{0}^{2N}\frac{g(1+it)}{\sinh(\pi t)}dt.$

Published on 15 Apr 2026 - 15:22

108

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Iterated polynomials modulo $p$ and divisibility properties

Published on 15 Apr 2026 - 13:52

44

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Flatten the curve between all points (with an optional constant)

Published on 14 Apr 2026 - 8:02

100

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A variation on the math.SE logo: does it have mathematical content?

Published on 10 Apr 2026 - 4:53

113

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How many prime numbers are there whose squares' decimal representation consist solely of integer squares?

Published on 17 Apr 2026 - 5:54

62

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Trading Gems to Maximize Long Term Profit

Published on 13 Apr 2026 - 0:25

255

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0.10110111011110... is irrational.

Published on 16 Apr 2026 - 10:33

387

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A new coin and balance problem

Published on 10 Apr 2026 - 22:47

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2-color version of Sylvester-Gallai theorem

A problem about Sindel sequences and the Prague clock

Set $S$ of integers $\ge0$ such that $\{1,2,\cdots,n\}$ partitions into $A, B$ with $\sum_\limits{a\in A}a^k=\sum_\limits{b\in B}b^k$ for all $k\in S$

How to find focus and directrix of $4y = x^2 -16$

Sum of squares and the linear sum

Just using $+$ ,$-$, $\times$ using any given n-1 integers, can we make a number divisible by n? (NO bracket allowed!!)

Alternative way of expressing a quantied statement with "Some"

$\lim\limits_{N\to\infty}\sum\limits_{n=1}^{2N}(-1)^ng(n)=ℑ\lim\limits_{N\to\infty}\int\limits_{0}^{2N}\frac{g(1+it)}{\sinh(\pi t)}dt.$

Iterated polynomials modulo $p$ and divisibility properties

Flatten the curve between all points (with an optional constant)

A variation on the math.SE logo: does it have mathematical content?

How many prime numbers are there whose squares' decimal representation consist solely of integer squares?

Trading Gems to Maximize Long Term Profit

0.10110111011110... is irrational.

A new coin and balance problem

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