List questions from modular-arithmetic

Published on 25 Mar 2026 - 17:52

112

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Proof that $\gcd(a,b) = \gcd(\operatorname{mod}(a,b),b) $

Published on 22 Mar 2026 - 11:53

171

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Fastest way to calculate $a^\binom{n}{r}\bmod M$ if $\binom{n}{r}$ is very large

Published on 25 Mar 2026 - 19:25

677

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Prove that $2^{2^5} +1 \equiv 0 \mod 641$

Published on 09 Jul 2018 - 15:21

35

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Adding extra digit $1$ or $7$ to a multidigit number changes remainder mod $3$

Published on 09 Jul 2018 - 22:04

102

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For many integers $n$, the digit sum of $(4n^2+1)^2$ is $19$. Is there something special about $19$?

Published on 25 Mar 2026 - 12:28

65

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Modular Exponentiation with power not within long long limit.

Published on 25 Mar 2026 - 20:59

869

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Solution of a congruence problem in number theory

Published on 10 Jul 2018 - 13:11

124

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How to evaluate $\binom{n}{k}\bmod{m}$

Published on 26 Mar 2026 - 21:35

51

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Greatest common divisor of coefficients

Published on 24 Mar 2026 - 19:01

312

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How are numbers distributed under a different modulus

Published on 10 Jul 2018 - 19:00

82

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How I finish this question about system of congruence $X \equiv a \pmod n, X \equiv b \pmod m$?

Published on 11 Jul 2018 - 1:21

94

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Show that angle BOC is $0.691$ radians

Published on 11 Jul 2018 - 3:03

331

Views

Are there primes $p=47\cdot 2^n+1$?

Published on 26 Mar 2026 - 14:42

85

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Find all the solutions of the polynomial equation $x^5+y^3 \equiv 1 \pmod9$.

Published on 11 Jul 2018 - 7:33

List Question

how to calculate $(b^{(p \bmod m)}) \bmod m$?

Proof that $\gcd(a,b) = \gcd(\operatorname{mod}(a,b),b) $

Fastest way to calculate $a^\binom{n}{r}\bmod M$ if $\binom{n}{r}$ is very large

Prove that $2^{2^5} +1 \equiv 0 \mod 641$

Adding extra digit $1$ or $7$ to a multidigit number changes remainder mod $3$

For many integers $n$, the digit sum of $(4n^2+1)^2$ is $19$. Is there something special about $19$?

Modular Exponentiation with power not within long long limit.

Solution of a congruence problem in number theory

How to evaluate $\binom{n}{k}\bmod{m}$

Greatest common divisor of coefficients

How are numbers distributed under a different modulus

How I finish this question about system of congruence $X \equiv a \pmod n, X \equiv b \pmod m$?

Show that angle BOC is $0.691$ radians

Are there primes $p=47\cdot 2^n+1$?

Find all the solutions of the polynomial equation $x^5+y^3 \equiv 1 \pmod9$.

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