Number theory-Modular arithmetic
3128
Why $9$ & $11$ are special in divisibility tests using decimal digit sums? (casting out nines & elevens)
127816
Number theory proof mod p
14783
A Number Theory problem (GCD)
119433
How to find modulo of large numbers like $9801\! \pmod {\!32}$
128634
Doubt related to a theorem in congruences of Chapter 5 of Apostol Introduction to analytic number theory
21108
Perfect squares and modularly congruency in mod 5
110703
How Can I prove (a+b) mod m = (a mod m) + (b mod m)) mod m?
141704
Fractional exponentiation in modular arithmetic
19071
solution set for congruence $x^2 \equiv 1 \mod m$
73020
Every integer is congruent to the sum of its digits mod 9
73515
Primes Number Theory
78852
If $\gcd(m,n) =1, $ then $m\mathbb{Z}/ mn\mathbb{Z} \cong \mathbb{Z}/(n)$
9039
What is the best way to solve modular arithmetic equations such as $9x \equiv 33 \pmod{43}$?
380
Bijection from modular multiplication?
13317
show that $a^{12} \equiv 1 \mod 32760$ for each $a \in \mathbb{Z}$ such that $\text{gcd}(a, 32760) = 1$
123482
How to compute $\mathbb{Z}_n^*$, the unit group of the integers modulo $n$?
149481
Number theory counting sums of squares modulus