List questions from divisibility

Published on 28 Mar 2026 - 12:49

180

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If $\gcd(a,b)=1$ , then $a-b$ does not divide $a+b$?

Published on 12 Apr 2026 - 18:41

244

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Do we conclude from these relations that $ny-hx \mid x(nx-h)$?

Published on 19 Sep 2015 - 10:44

108

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Can $2^{1947}\times 5+1|2^{2^{1945}}+1$ be shown by hand?

Published on 19 Sep 2015 - 18:10

52

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Polynomial Divisibilty Test

Published on 08 Apr 2026 - 6:32

84

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If $(b,n)=1$, $n\mid(ad-bc)$ and $n\mid(a-b)$ then $n\mid (c-d)$.

Published on 03 Apr 2026 - 7:32

31

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Formula that devides date(given in millisecounds)

Published on 11 Apr 2026 - 21:49

37

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Why does this condition check the expectation?

Published on 12 Apr 2026 - 5:35

1.2k

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What are the "units" and "non-trivial divisors of zero" in a ring?

Published on 12 Apr 2026 - 5:19

502

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If $a | b$, prove that $\gcd(a,b)$=$|a|$.

Published on 12 Apr 2026 - 16:41

56

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How can I construct a number $n$, such that $gcd(n+k,100!)\ne 1$ for all $k=0,...,256$

Published on 12 Apr 2026 - 19:47

28

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Is division by $\sum x_i-\bar{x}$ actually null?

Published on 11 Apr 2026 - 10:47

374

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Number Theory: Prove there are infinitely many primes $p$ satisfying $n\mid (p-1)$

Published on 01 Apr 2026 - 5:05

26

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How can I improve my basic proof about divisibility

Published on 08 Apr 2026 - 16:42

3.5k

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Showing that a number is not divisible by another.

Published on 11 Apr 2026 - 5:26

List Question

If $p\equiv 3\pmod{4}$ and $p\mid x^2+y^2$, prove $p\mid x,y$.

If $\gcd(a,b)=1$ , then $a-b$ does not divide $a+b$?

Do we conclude from these relations that $ny-hx \mid x(nx-h)$?

Can $2^{1947}\times 5+1|2^{2^{1945}}+1$ be shown by hand?

Polynomial Divisibilty Test

If $(b,n)=1$, $n\mid(ad-bc)$ and $n\mid(a-b)$ then $n\mid (c-d)$.

Formula that devides date(given in millisecounds)

Why does this condition check the expectation?

What are the "units" and "non-trivial divisors of zero" in a ring?

If $a | b$, prove that $\gcd(a,b)$=$|a|$.

How can I construct a number $n$, such that $gcd(n+k,100!)\ne 1$ for all $k=0,...,256$

Is division by $\sum x_i-\bar{x}$ actually null?

Number Theory: Prove there are infinitely many primes $p$ satisfying $n\mid (p-1)$

How can I improve my basic proof about divisibility

Showing that a number is not divisible by another.

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