Question

Why do all "divisibility tricks" seem to use linear combinations, and are there any that don't?

score 2.5k · Answer 1 · 2026-04-14 10:19:07

2.5k

Views

Why do all "divisibility tricks" seem to use linear combinations, and are there any that don't?

Published on 14 Apr 2026 - 10:19

score 78 · Answer 2 · 2026-04-16 01:17:37

78

Views

Are there numbers $n$ such that the period of $1/p$ is not $n$ for any prime $p$?

Published on 16 Apr 2026 - 1:17

score 37 · Answer 3 · 2026-04-23 10:25:32

37

Views

How would you solve for a function when given only the relationships between its transformations?

Published on 23 Apr 2026 - 10:25

score 115 · Answer 4 · 2026-04-17 06:34:12

115

Views

Generate an explicit formula for: $a_n=a_{n-1}+n^2-5n+7, a_3=2$

Published on 17 Apr 2026 - 6:34

score 48 · Answer 5 · 2026-04-14 18:42:48

48

Views

I'm wanting to know the name of a mathematical method to find out what is the most profitable range of certain values

Published on 14 Apr 2026 - 18:42

score 122 · Answer 6 · 2026-04-14 23:06:01

122

Views

olympiad problem using the fact that $|G|\leq f(|\mathrm{Aut}(G)|)$

Published on 14 Apr 2026 - 23:06

score 968 · Answer 7 · 2026-04-11 20:47:54

968

Views

Better to play more tickets in the same lottery, or one ticket in several lotteries?

Published on 11 Apr 2026 - 20:47

score 56 · Answer 8 · 2026-04-12 15:29:51

56

Views

Maximising Time Spent Running in a Video Game

Published on 12 Apr 2026 - 15:29

score 1.2k · Answer 9 · 2026-04-14 09:59:48

1.2k

Views

How to calculate the number of paths of minimum length possible a knight can take to get from one corner of a chess board to the opposite one?

Published on 14 Apr 2026 - 9:59

score 166 · Answer 10 · 2026-04-26 07:46:10

166

Views

A problem given to high school students

Published on 26 Apr 2026 - 7:46

score 90 · Answer 11 · 2026-04-08 22:04:26

90

Views

Probability of outcomes in numerology (history)

Published on 08 Apr 2026 - 22:04

score 52 · Answer 12 · 2026-04-26 07:52:11

52

Views

Why is this recursively-defined permutation $\sigma:\mathbb{N}\to\mathbb{N}$ symmetrical in the sense that $\sigma(\sigma(n))=n\ $?

Published on 26 Apr 2026 - 7:52

score 258 · Answer 13 · 2026-04-15 15:29:42

258

Views

What do the symbols in the April 13, 2022 xkcd comic actually mean?

Published on 15 Apr 2026 - 15:29

score 121 · Answer 14 · 2026-04-16 12:17:16

121

Views

Inverting a $n \times n$ board filled with knights

Published on 16 Apr 2026 - 12:17

score 42 · Answer 15 · 2026-04-15 21:52:24

42

Views

Presence of a distinct number line in a lattice square

Published on 15 Apr 2026 - 21:52

List Question

Why do all "divisibility tricks" seem to use linear combinations, and are there any that don't?

Are there numbers $n$ such that the period of $1/p$ is not $n$ for any prime $p$?

How would you solve for a function when given only the relationships between its transformations?

Generate an explicit formula for: $a_n=a_{n-1}+n^2-5n+7, a_3=2$

I'm wanting to know the name of a mathematical method to find out what is the most profitable range of certain values

olympiad problem using the fact that $|G|\leq f(|\mathrm{Aut}(G)|)$

Better to play more tickets in the same lottery, or one ticket in several lotteries?

Maximising Time Spent Running in a Video Game

How to calculate the number of paths of minimum length possible a knight can take to get from one corner of a chess board to the opposite one?

A problem given to high school students

Probability of outcomes in numerology (history)

Why is this recursively-defined permutation $\sigma:\mathbb{N}\to\mathbb{N}$ symmetrical in the sense that $\sigma(\sigma(n))=n\ $?

What do the symbols in the April 13, 2022 xkcd comic actually mean?

Inverting a $n \times n$ board filled with knights

Presence of a distinct number line in a lattice square

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