List questions from divisibility

Published on 06 Dec 2016 - 7:23

83

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Is $d|b$ and $d|a$ true in $d = l \cdot a + k \cdot b$

Published on 06 Dec 2016 - 13:45

153

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How do I show this :for odd $n$ :$\displaystyle\ (2^{n!}-1) \bmod n=0$?

Published on 06 Dec 2016 - 23:06

45

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How is $a \equiv b \pmod m $

Published on 01 Apr 2026 - 22:40

182

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Finding $26$th digit of a number.

Published on 04 Apr 2026 - 15:18

1.4k

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How to find modulo of large numbers like $9801\! \pmod {\!32}$

Published on 07 Dec 2016 - 19:10

456

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Pairs of consecutive integers that have a prime factor $s<100$

Published on 08 Dec 2016 - 8:19

416

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West German Mathematics Olympiad 1981

Published on 08 Dec 2016 - 12:09

92

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Is there integer :$n>0$ for which $\displaystyle\frac{n^4+(n+1)^4}{n²+(n+1)^2}$ is integer?

Published on 30 Mar 2026 - 14:25

312

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Division in natural numbers

Published on 09 Dec 2016 - 21:02

1k

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Numbers which are divisible by the sum of their prime factors.

Published on 09 Dec 2016 - 21:39

725

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Use induction to prove the following statement.

Published on 10 Dec 2016 - 4:23

499

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Method for coming up with consecutive integers not relatively prime to $(100!)$

Published on 10 Dec 2016 - 8:06

175

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Common divisors of $a , b$ and $a$ mod $b$

Published on 30 Mar 2026 - 14:25

64

Views

Particular method to prove that if $\gcd(a,b,c)=1$ then there exists $n\in \mathbb{Z}$ such that :

Published on 30 Mar 2026 - 14:26

List Question

Prove this Equation is Divisible By...

Is $d|b$ and $d|a$ true in $d = l \cdot a + k \cdot b$

How do I show this :for odd $n$ :$\displaystyle\ (2^{n!}-1) \bmod n=0$?

How is $a \equiv b \pmod m $

Finding $26$th digit of a number.

How to find modulo of large numbers like $9801\! \pmod {\!32}$

Pairs of consecutive integers that have a prime factor $s<100$

West German Mathematics Olympiad 1981

Is there integer :$n>0$ for which $\displaystyle\frac{n^4+(n+1)^4}{n²+(n+1)^2}$ is integer?

Division in natural numbers

Numbers which are divisible by the sum of their prime factors.

Use induction to prove the following statement.

Method for coming up with consecutive integers not relatively prime to $(100!)$

Common divisors of $a , b$ and $a$ mod $b$

Particular method to prove that if $\gcd(a,b,c)=1$ then there exists $n\in \mathbb{Z}$ such that :

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