List questions from recreational-mathematics

Published on 13 Apr 2026 - 5:28

32

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Price Difference Question. Unable to derive 3rd equation

Published on 09 Apr 2026 - 17:25

97

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Name of this type of plot? Does anyone know how to produce it

Published on 25 Mar 2026 - 9:38

82

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Implications of redefining base natural logarithm constant e

Published on 14 Mar 2015 - 20:49

49

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Anyone know of a good composite number counter?

Published on 12 Apr 2026 - 22:17

3.9k

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How to prove that there are no integers a,b such that $b^2=4a+2$

Published on 12 Apr 2026 - 8:26

503

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Do any of these sequences have infinitely-many distinct iterates under run-length substitution?

Published on 16 Mar 2015 - 1:28

57

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Find an integer $k$ such that $a_{k} = 2^{261}$?

Published on 16 Mar 2015 - 10:52

68

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Find $a_{n}$ if $(a_{n})$ is a sequence such that $a_{1} := 1$ and $\frac{1}{a_{n+1}} = \frac{2}{a_{n}} + 3$ for $n \geq 2$?

Published on 16 Mar 2015 - 11:35

89

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How can you prove that a collection of union set is equal to the set of natural numbers?

Published on 12 Apr 2026 - 14:48

1.7k

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How to prove intersections and subsets of sets

Published on 12 Apr 2026 - 9:45

138

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How to prove if $A \times C \subseteq B \times D \implies A \subseteq B$

Published on 17 Mar 2015 - 4:28

240

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How to tell if a function and a composite function is onto or one to one

Published on 11 Apr 2026 - 17:29

128

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How would you prove that $2^{n-1} > n!$?

Published on 13 Apr 2026 - 5:54

55

Views

Would the powerset of $\mathbb{Z}$ also not denumerable?

Published on 11 Apr 2026 - 11:50

List Question

When A was half B's age, B was one fourth A's age.

Price Difference Question. Unable to derive 3rd equation

Name of this type of plot? Does anyone know how to produce it

Implications of redefining base natural logarithm constant e

Anyone know of a good composite number counter?

How to prove that there are no integers a,b such that $b^2=4a+2$

Do any of these sequences have infinitely-many distinct iterates under run-length substitution?

Find an integer $k$ such that $a_{k} = 2^{261}$?

Find $a_{n}$ if $(a_{n})$ is a sequence such that $a_{1} := 1$ and $\frac{1}{a_{n+1}} = \frac{2}{a_{n}} + 3$ for $n \geq 2$?

How can you prove that a collection of union set is equal to the set of natural numbers?

How to prove intersections and subsets of sets

How to prove if $A \times C \subseteq B \times D \implies A \subseteq B$

How to tell if a function and a composite function is onto or one to one

How would you prove that $2^{n-1} > n!$?

Would the powerset of $\mathbb{Z}$ also not denumerable?

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