List questions from modular-arithmetic

Published on 29 Mar 2026 - 20:54

572

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Working out modulo of negative powers

Published on 26 Aug 2019 - 2:02

303

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Does $2^n \bmod n$ ever repeat?

Published on 26 Aug 2019 - 12:17

863

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What is the last non-zero digit of $(\dots((2018\underset{! \text{ occurs }1009\text{ times}}{\underbrace{!)!)!\dots)!}}$?

Published on 25 Mar 2026 - 21:50

1.1k

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Ordered pair solutions of $x^2-y^2 \equiv a \pmod p.$

Published on 26 Aug 2019 - 20:46

1.1k

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Orders of primitive roots

Published on 25 Mar 2026 - 16:45

100

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In Lucas Sequence, should numerator always be even when calculating $v_{2k}$?

Published on 02 Apr 2026 - 21:47

277

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Congruence with power

Published on 27 Aug 2019 - 7:59

299

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Prove for any positive odd integer $n$, $3\mid n$ or $n^2 \equiv 1 \pmod {12}$

Published on 27 Aug 2019 - 12:10

229

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Show $a^p \equiv a \mod 2p$

Published on 27 Aug 2019 - 13:04

1k

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From Fermat's Theorem to The Chinese Remainder Theorem

Published on 25 Mar 2026 - 21:49

42

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Proof about congruences

Published on 27 Aug 2019 - 18:06

520

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Expectation of $\min(a \bmod p,2a\bmod p,....,ka \bmod p)$

Published on 01 Apr 2026 - 15:54

37

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Determine the number of positive integers that share at least one of the numbers

Published on 29 Aug 2019 - 11:15

140

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Primitive Root Modular Arithmetic Question

Published on 30 Aug 2019 - 3:59

List Question

Insight into $\pmod {2^n \pm 1}$

Working out modulo of negative powers

Does $2^n \bmod n$ ever repeat?

What is the last non-zero digit of $(\dots((2018\underset{! \text{ occurs }1009\text{ times}}{\underbrace{!)!)!\dots)!}}$?

Ordered pair solutions of $x^2-y^2 \equiv a \pmod p.$

Orders of primitive roots

In Lucas Sequence, should numerator always be even when calculating $v_{2k}$?

Congruence with power

Prove for any positive odd integer $n$, $3\mid n$ or $n^2 \equiv 1 \pmod {12}$

Show $a^p \equiv a \mod 2p$

From Fermat's Theorem to The Chinese Remainder Theorem

Proof about congruences

Expectation of $\min(a \bmod p,2a\bmod p,....,ka \bmod p)$

Determine the number of positive integers that share at least one of the numbers

Primitive Root Modular Arithmetic Question

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