List questions from divisibility

Published on 09 Apr 2026 - 16:43

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What is your idea about this conjecture?

Published on 11 Apr 2026 - 20:13

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Divisibility of factorials

Published on 04 Apr 2026 - 2:28

148

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Finding the digits of the number $789ABC$

Published on 13 Apr 2026 - 9:51

48

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Determine All Divisors of $f(x)=x^n\in F[x]$

Published on 07 Nov 2015 - 19:20

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Prove that ∀a, b, u, v ∈ Z − {0} ua + vb = 1 → gcd(a, b) = 1

Published on 03 Apr 2026 - 14:28

124

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If $3^2$ divides $2^n-1$, then $n$ must be divisible by $6$

Published on 30 Mar 2026 - 10:40

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Prove if a | b, then a | bc for all integers c ,true

Published on 10 Apr 2026 - 19:53

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On patterns of divisibility of the sequences of the from $a^n+b$

Published on 08 Nov 2015 - 11:48

80

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prove polynomial division for any natural number

Published on 13 Apr 2026 - 18:13

3.7k

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$n^2$ is a multiple of $3$, then $n$ is a multiple of $3$

Published on 10 Apr 2026 - 9:18

201

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If $m$ is even, and $n$ is odd, does $2(m+n)+2$ have to be divisible by $4?

Published on 09 Nov 2015 - 1:16

45

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Q: Prove: $gcd(a,n)=1, n \in \mathbb{N}, a \in \mathbb{Z} \implies \forall c \in \mathbb{Z}\ \exists m \in \mathbb{Z}\,:\, ma=c \pmod{n}$

Published on 09 Nov 2015 - 22:26

212

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when is $\frac{1}{n}\binom{n}{r}$ an integer

Published on 01 Apr 2026 - 22:44

215

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Divisibility of $\binom{n}{r}$ by $n$.

Published on 11 Nov 2015 - 14:36

List Question

Prove that 17 divides 1111111111111111 (16 1's) and doesn't divide 11111111

What is your idea about this conjecture?

Divisibility of factorials

Finding the digits of the number $789ABC$

Determine All Divisors of $f(x)=x^n\in F[x]$

Prove that ∀a, b, u, v ∈ Z − {0} ua + vb = 1 → gcd(a, b) = 1

If $3^2$ divides $2^n-1$, then $n$ must be divisible by $6$

Prove if a | b, then a | bc for all integers c ,true

On patterns of divisibility of the sequences of the from $a^n+b$

prove polynomial division for any natural number

$n^2$ is a multiple of $3$, then $n$ is a multiple of $3$

If $m$ is even, and $n$ is odd, does $2(m+n)+2$ have to be divisible by $4?

Q: Prove: $gcd(a,n)=1, n \in \mathbb{N}, a \in \mathbb{Z} \implies \forall c \in \mathbb{Z}\ \exists m \in \mathbb{Z}\,:\, ma=c \pmod{n}$

when is $\frac{1}{n}\binom{n}{r}$ an integer

Divisibility of $\binom{n}{r}$ by $n$.

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