New posts in Modular Arithmetic

Pattern for all the binary chains divisible by 5

Explain the solution to USAMO $1991/\rm P3$

find the remainder for $\color{purple}{TETRATION}$ such that $( {^{2021}2021}(\mod13))$

$4q=a^2+27b^2$ elementary proof of uniqueness

Find all the solutions of $x^2 \equiv 1 \mbox{ mod }365$.

Prove arithmetic formula for the number of bits in $j=2^k-1$

What exactly is $\mathbb{Z_n}$?

What is the remainder when $1^n + 2^n + 3^n + \ldots + 99^n$ is divided by $1 + 2 + 3 + \ldots + 99$?

For any odd prime $p$, a quadratic is solvable mod $p^2$ if it is solvable mod $p$, and $p$ does not divide the discriminant and leading coefficient.

Starting with $1,9,9,3$ the sequence continues as the last digit of the sum of preceding 4 terms. Will subsequence $7, 3, 6, 7$ ever appear in it?