List questions from modular-arithmetic

Published on 25 Mar 2026 - 21:48

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Direct proof that the product of odd integers is odd

Published on 30 Mar 2026 - 13:40

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How to show $(n-1)^3n^3(n+1)^3$ is divisible by 7 and 9?

Published on 25 Mar 2026 - 21:49

129

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Floor function inequality: $\frac{n^2}{x}-\left\lfloor\frac{n^2}{x}\right\rfloor+\frac{2n+1}{x}-\left\lfloor\frac{2n+1}{x}\right\rfloor<1$

Published on 14 May 2014 - 17:01

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How to prove $N=13\times12v+6\times19u$ is a solution for the system?

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How to show $2^{k+2}$ divides $3^{2^k}-1$ but $2^{k+3}$ doesn't?

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What are primitive roots modulo n?

Published on 25 Mar 2026 - 18:24

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Matrix double modulo multiplication to get identity

Published on 14 May 2014 - 21:52

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Sum of the jumbled digits of $abc_{10}$ is $3194$

Published on 16 May 2014 - 5:32

370

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Calculating $x^{103} \equiv 2 \pmod{143}$

Published on 17 May 2014 - 11:58

69

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How to calculate sum of digit of a power

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How to find all elements in Z/80 that have multiplicative inverses.

Published on 25 Mar 2026 - 7:48

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Matrix Induction proofs using $\rm mod$.

Published on 03 Apr 2026 - 10:05

688

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Showing equality of primitive roots with quadratic non-residues.

Published on 18 May 2014 - 13:31

79

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Simple modulo congruence operation

Published on 19 May 2014 - 1:04

List Question

Find all values of parameter A such that two system of congruences are equal

Direct proof that the product of odd integers is odd

How to show $(n-1)^3n^3(n+1)^3$ is divisible by 7 and 9?

Floor function inequality: $\frac{n^2}{x}-\left\lfloor\frac{n^2}{x}\right\rfloor+\frac{2n+1}{x}-\left\lfloor\frac{2n+1}{x}\right\rfloor<1$

How to prove $N=13\times12v+6\times19u$ is a solution for the system?

How to show $2^{k+2}$ divides $3^{2^k}-1$ but $2^{k+3}$ doesn't?

What are primitive roots modulo n?

Matrix double modulo multiplication to get identity

Sum of the jumbled digits of $abc_{10}$ is $3194$

Calculating $x^{103} \equiv 2 \pmod{143}$

How to calculate sum of digit of a power

How to find all elements in Z/80 that have multiplicative inverses.

Matrix Induction proofs using $\rm mod$.

Showing equality of primitive roots with quadratic non-residues.

Simple modulo congruence operation

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