List questions from recreational-mathematics

Published on 01 Mar 2023 - 15:02

330

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Are there an infinity of consecutive primes that have no common digit?

Published on 28 Mar 2026 - 1:48

119

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Peculiar nature of $x^{22}+y^{22}=1$

Published on 09 Apr 2026 - 2:21

78

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Why is this equation not representing a superellipse$?$

Published on 09 Apr 2026 - 2:19

205

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The Pi day and rational point on the ball

Published on 28 Mar 2026 - 17:41

67

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is this set finite, infinitely countable, or uncountable?

Published on 04 Mar 2023 - 17:14

100

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Solving the system $\Big\{\!\small\begin{array}{l}x+y+z =1 \\ \sqrt{4x+1}+\sqrt{4y+1}+\sqrt{4z+1}=\sqrt{21} \end{array}$

Published on 05 Mar 2023 - 8:31

116

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Is $n=2$ the only even solution of $\sigma(\sigma(n)+n)=2\sigma(n)$?

Published on 29 Mar 2026 - 8:20

84

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For which initial angles does a ray of light go back in a ellipse?

Published on 07 Apr 2026 - 3:18

56

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Creating problem about pascal's triangle column sum identity

Published on 08 Apr 2026 - 20:53

191

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Colour $2$ or $3$ numbers that total $15$

Published on 29 Mar 2026 - 18:17

150

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What is the Galois group of Conway's Look-and-say polynomial?

Published on 14 Mar 2023 - 2:22

288

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Prove that this expression is equal to $\pi$

Published on 14 Mar 2023 - 11:22

74

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Searching for Martin Gardner / Dr. Matrix reference

Published on 09 Apr 2026 - 10:06

81

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Solution of $\sigma(\sigma(m)+m)=2\sigma(m)$ with $\omega(m)>8$?

Published on 29 Mar 2026 - 8:20

List Question

When will the moons and the planet all be on one straight line again?

Are there an infinity of consecutive primes that have no common digit?

Peculiar nature of $x^{22}+y^{22}=1$

Why is this equation not representing a superellipse$?$

The Pi day and rational point on the ball

is this set finite, infinitely countable, or uncountable?

Solving the system $\Big\{\!\small\begin{array}{l}x+y+z =1 \\ \sqrt{4x+1}+\sqrt{4y+1}+\sqrt{4z+1}=\sqrt{21} \end{array}$

Is $n=2$ the only even solution of $\sigma(\sigma(n)+n)=2\sigma(n)$?

For which initial angles does a ray of light go back in a ellipse?

Creating problem about pascal's triangle column sum identity

Colour $2$ or $3$ numbers that total $15$

What is the Galois group of Conway's Look-and-say polynomial?

Prove that this expression is equal to $\pi$

Searching for Martin Gardner / Dr. Matrix reference

Solution of $\sigma(\sigma(m)+m)=2\sigma(m)$ with $\omega(m)>8$?

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