Question

Probability of a single number from a set $\{1,2,3...1000\}$ being a multiple of any two $7,11$ or $13$

score 208 · Answer 1 · 2026-04-16 15:50:39

208

Views

Probability of a single number from a set $\{1,2,3...1000\}$ being a multiple of any two $7,11$ or $13$

Published on 16 Apr 2026 - 15:50

score 223 · Answer 2 · 2026-04-14 21:52:48

223

Views

Is there an explicit function mapping $2^n+2^m$ to $(n,m)$?

Published on 14 Apr 2026 - 21:52

score 78 · Answer 3 · 2026-05-11 02:01:48

78

Views

Find digits $a,b$ such that $7ab + 4ba = 1a21$.

Published on 11 May 2026 - 2:01

score 1.4k · Answer 4 · 2026-04-15 08:59:18

1.4k

Views

How to check if some number, say a, can be expressed as a = b + reverse(b) ? Where b is some natural number.

Published on 15 Apr 2026 - 8:59

score 128 · Answer 5 · 2026-04-13 07:20:23

128

Views

What is the largest three-digit integer that when cubed, the result ends in itself

Published on 13 Apr 2026 - 7:20

score 174 · Answer 6 · 2026-04-17 01:06:03

174

Views

A number theory question: every integer n ≥ K can be written as n = xa + yb where a, b ∈ Z are nonnegative.

Published on 17 Apr 2026 - 1:06

score 198 · Answer 7 · 2026-04-12 17:58:52

198

Views

Is this proof of the uniqueness of prime factorizations unnecessarily long?

Published on 12 Apr 2026 - 17:58

score 461 · Answer 8 · 2026-04-12 08:42:27

461

Views

International Zhautykov Olympiad 2019 problem 5

Published on 12 Apr 2026 - 8:42

score 139 · Answer 9 · 2026-04-15 10:42:17

139

Views

How to elegantly find the remainder of $en$ divided by $n+1+\frac{n-1}{d}$

Published on 15 Apr 2026 - 10:42

score 91 · Answer 10 · 2026-05-14 08:53:20

91

Views

Is there a positive integer $n$ where $14$ divide $30^n$? Explain why.

Published on 14 May 2026 - 8:53

score 1.9k · Answer 11 · 2026-04-13 15:36:57

1.9k

Views

Number of steps in Euclidean algorithm

Published on 13 Apr 2026 - 15:36

score 103 · Answer 12 · 2026-05-11 00:34:51

103

Views

Prove that there exist infinitely many $n$ such that $d(n+1)>d(n)$, where $d(n)$ is number of positive factors

Published on 11 May 2026 - 0:34

score 310 · Answer 13 · 2026-04-16 07:49:36

310

Views

Congruence proof $ax \equiv b $ mod $m$

Published on 16 Apr 2026 - 7:49

score 61 · Answer 14 · 2026-05-10 16:33:31

61

Views

Nonabelian dihedral groups and a question in number theory

Published on 10 May 2026 - 16:33

score 146 · Answer 15 · 2026-04-14 10:31:16

146

Views

Do there exist super-Wieferich primes?

Published on 14 Apr 2026 - 10:31

List Question

Probability of a single number from a set $\{1,2,3...1000\}$ being a multiple of any two $7,11$ or $13$

Is there an explicit function mapping $2^n+2^m$ to $(n,m)$?

Find digits $a,b$ such that $7ab + 4ba = 1a21$.

How to check if some number, say a, can be expressed as a = b + reverse(b) ? Where b is some natural number.

What is the largest three-digit integer that when cubed, the result ends in itself

A number theory question: every integer n ≥ K can be written as n = xa + yb where a, b ∈ Z are nonnegative.

Is this proof of the uniqueness of prime factorizations unnecessarily long?

International Zhautykov Olympiad 2019 problem 5

How to elegantly find the remainder of $en$ divided by $n+1+\frac{n-1}{d}$

Is there a positive integer $n$ where $14$ divide $30^n$? Explain why.

Number of steps in Euclidean algorithm

Prove that there exist infinitely many $n$ such that $d(n+1)>d(n)$, where $d(n)$ is number of positive factors

Congruence proof $ax \equiv b $ mod $m$

Nonabelian dihedral groups and a question in number theory

Do there exist super-Wieferich primes?

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