Question

If sum of reciprocals of numbers is an integer, then there exists a subset with sum of reciprocals of 1

score 1.5k · Answer 1 · 2026-04-11 11:51:26

1.5k

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If sum of reciprocals of numbers is an integer, then there exists a subset with sum of reciprocals of 1

Published on 11 Apr 2026 - 11:51

score 52 · Answer 2 · 2026-04-14 21:42:10

52

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Find the row/column of the $n^\text{th}$ word in a list of words arranged in a grid

Published on 14 Apr 2026 - 21:42

score 291 · Answer 3 · 2026-04-16 13:14:38

291

Views

triangles in $\mathbb{R}^n$ with all vertices in $\mathbb{Q}^n$

Published on 16 Apr 2026 - 13:14

score 107 · Answer 4 · 2026-04-09 01:15:32

107

Views

Finding prime factors of large expression (without calculator)

Published on 09 Apr 2026 - 1:15

score 512 · Answer 5 · 2026-04-11 02:47:04

512

Views

Is Modular Arithmetic Notation Good?

Published on 11 Apr 2026 - 2:47

score 85 · Answer 6 · 2026-04-14 06:14:17

85

Views

Do positive integers $a,b,c,d$ exist with the given properties?

Published on 14 Apr 2026 - 6:14

score 105 · Answer 7 · 2026-04-12 19:06:08

105

Views

sum of integers using order of integers and primitive roots

Published on 12 Apr 2026 - 19:06

score 109 · Answer 8 · 2026-04-16 08:27:35

109

Views

If $\min\{x \in\mathbb{N} : xn+1 \text{ is a square}\} \geq \frac{n}{4}$ then n is prime.

Published on 16 Apr 2026 - 8:27

score 91 · Answer 9 · 2026-04-16 03:24:46

91

Views

Solving $ab\equiv d \pmod c $ knowing $b, c \text{ and }d.$

Published on 16 Apr 2026 - 3:24

score 1.3k · Answer 10 · 2026-04-16 07:00:19

1.3k

Views

Proof by Induction: For any integer $n > 0$, $3|(5^{2n} − 1)$.

Published on 16 Apr 2026 - 7:00

score 81 · Answer 11 · 2026-04-13 17:53:11

81

Views

(n+7)(n-4)+33/121 is always a fraction

Published on 13 Apr 2026 - 17:53

score 223 · Answer 12 · 2026-04-15 20:06:58

223

Views

If $ab \mid c(c^2-c+1)$ and $c^2+1 \mid a+b$ then prove that $\{a, b\}=\{c, c^2-c+1 \}$

Published on 15 Apr 2026 - 20:06

score 52 · Answer 13 · 2026-04-12 19:06:23

52

Views

Sum of remaining of 2^k divided by 2003

Published on 12 Apr 2026 - 19:06

score 4.2k · Answer 14 · 2026-04-11 19:09:35

4.2k

Views

Proof that every prime has a primitive root.

Published on 11 Apr 2026 - 19:09

score 90 · Answer 15 · 2026-04-12 19:26:31

90

Views

Can a primitive integral polynomial represent integers prime to any number?

Published on 12 Apr 2026 - 19:26

List Question

If sum of reciprocals of numbers is an integer, then there exists a subset with sum of reciprocals of 1

Find the row/column of the $n^\text{th}$ word in a list of words arranged in a grid

triangles in $\mathbb{R}^n$ with all vertices in $\mathbb{Q}^n$

Finding prime factors of large expression (without calculator)

Is Modular Arithmetic Notation Good?

Do positive integers $a,b,c,d$ exist with the given properties?

sum of integers using order of integers and primitive roots

If $\min\{x \in\mathbb{N} : xn+1 \text{ is a square}\} \geq \frac{n}{4}$ then n is prime.

Solving $ab\equiv d \pmod c $ knowing $b, c \text{ and }d.$

Proof by Induction: For any integer $n > 0$, $3|(5^{2n} − 1)$.

(n+7)(n-4)+33/121 is always a fraction

If $ab \mid c(c^2-c+1)$ and $c^2+1 \mid a+b$ then prove that $\{a, b\}=\{c, c^2-c+1 \}$

Sum of remaining of 2^k divided by 2003

Proof that every prime has a primitive root.

Can a primitive integral polynomial represent integers prime to any number?

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