List questions from modular-arithmetic

Published on 26 Mar 2026 - 1:06

204

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Calculating how many 2's appear in the last digits of the first 2004 Fibonacci numbers.

Published on 26 Mar 2026 - 8:00

91

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$5\nmid n(n+1)\implies 5\mid (n^3-6n^2+n-1)$

Published on 11 Jan 2019 - 21:19

160

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multiply different residue classes

Published on 12 Jan 2019 - 12:56

2.2k

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How to find the inverse of a number in a congruence relation

Published on 24 Mar 2026 - 23:48

70

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Show that $\pi$ is onto.

Published on 12 Jan 2019 - 16:12

693

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If $x \geq y>x/2$ then is it true that $x \pmod y < x/2$?

Published on 13 Jan 2019 - 5:04

62

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Why must any solution of this congruence equation satisfy gcd(x,11)=1?

Published on 13 Jan 2019 - 9:56

425

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Patterns in division graphs modulo $n$

Published on 25 Mar 2026 - 4:34

114

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Multiplicative order of $a\bmod c^{k+1}$

Published on 25 Mar 2026 - 21:01

383

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Power tower last digits

Published on 27 Mar 2026 - 21:43

95

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To determine the remainder of the division

Published on 14 Jan 2019 - 0:20

51

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How to simplify $2 q^{\frac{k-1}{2}} n^2 - \sigma(q^{\frac{k-1}{2}})\sigma(n^2)$

Published on 25 Mar 2026 - 7:54

65

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7-test and 13-test for correcting additions and multiplications

Published on 14 Jan 2019 - 12:59

748

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Solution to $x^2 \equiv 1$ (mod $pq$), $p,q \geq 3$ primes.

Published on 15 Jan 2019 - 0:45

List Question

A question concerning higher residues (quadratic and so on)

Calculating how many 2's appear in the last digits of the first 2004 Fibonacci numbers.

$5\nmid n(n+1)\implies 5\mid (n^3-6n^2+n-1)$

multiply different residue classes

How to find the inverse of a number in a congruence relation

Show that $\pi$ is onto.

If $x \geq y>x/2$ then is it true that $x \pmod y < x/2$?

Why must any solution of this congruence equation satisfy gcd(x,11)=1?

Patterns in division graphs modulo $n$

Multiplicative order of $a\bmod c^{k+1}$

Power tower last digits

To determine the remainder of the division

How to simplify $2 q^{\frac{k-1}{2}} n^2 - \sigma(q^{\frac{k-1}{2}})\sigma(n^2)$

7-test and 13-test for correcting additions and multiplications

Solution to $x^2 \equiv 1$ (mod $pq$), $p,q \geq 3$ primes.

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