List questions from modular-arithmetic

Published on 13 Apr 2026 - 1:18

120

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Find the inverse of 105 mod 4

Published on 13 Nov 2019 - 12:38

72

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Field homomorphism $\mathbb{Z}/3\mathbb{Z} \to \mathbb{Z}/5\mathbb{Z}$

Published on 25 Mar 2026 - 14:38

155

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Prove $N_n \equiv\frac{n(n+1)}{2}\mod 9$

Published on 14 Nov 2019 - 1:55

158

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Why are the elements of the Cyclic Group with Generator $\langle 3 \rangle$ in $\mathbb{Z_{15}}$ {0, 3, 6, 9, 12} and not {1, 3, 9}

Published on 29 Mar 2026 - 18:33

251

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Null Space Modulo A Non-Prime Integer

Published on 12 Apr 2026 - 18:27

626

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What is U(1)/Z2 isomorphic to?

Published on 27 Mar 2026 - 19:58

246

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Solving system of Congruences with Two Variables (x and y)

Published on 11 Apr 2026 - 18:25

110

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$(-4339 \cdot 8559) \text{ mod } 43$ without calculator

Published on 02 Apr 2026 - 15:39

162

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Congruences of consecutive Fibonacci numbers

Published on 12 Apr 2026 - 2:18

48

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Prove that if $P = 2^m + 1$ is a prime then $Prob((g^x \bmod P) \bmod 2 = x \bmod 2) = \frac{1}{2}$.

Published on 16 Nov 2019 - 9:47

82

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How to do modular arithmetic with a negative n

Published on 12 Apr 2026 - 12:13

49

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Misunderstanding with eigenvalues in $\mathbb F_2$

Published on 03 Apr 2026 - 14:06

448

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What can primes (except 2,3, or 5) be congruent to (mod 30)?

Published on 17 Nov 2019 - 3:35

293

Views

Proving a subring of $\Bbb Z[\zeta_{11}]$ is PID

Published on 10 Apr 2026 - 22:42

List Question

Finding the inverse of 84 mod 5

Find the inverse of 105 mod 4

Field homomorphism $\mathbb{Z}/3\mathbb{Z} \to \mathbb{Z}/5\mathbb{Z}$

Prove $N_n \equiv\frac{n(n+1)}{2}\mod 9$

Why are the elements of the Cyclic Group with Generator $\langle 3 \rangle$ in $\mathbb{Z_{15}}$ {0, 3, 6, 9, 12} and not {1, 3, 9}

Null Space Modulo A Non-Prime Integer

What is U(1)/Z2 isomorphic to?

Solving system of Congruences with Two Variables (x and y)

$(-4339 \cdot 8559) \text{ mod } 43$ without calculator

Congruences of consecutive Fibonacci numbers

Prove that if $P = 2^m + 1$ is a prime then $Prob((g^x \bmod P) \bmod 2 = x \bmod 2) = \frac{1}{2}$.

How to do modular arithmetic with a negative n

Misunderstanding with eigenvalues in $\mathbb F_2$

What can primes (except 2,3, or 5) be congruent to (mod 30)?

Proving a subring of $\Bbb Z[\zeta_{11}]$ is PID

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