$4^{2020} - 2020$ mod $48$
92518
mod Distributive Law, factoring $\!\!\bmod\!\!:$ $\ ab\bmod ac = a(b\bmod c)$
27287
$-1$ is a quadratic residue modulo $p$ if and only if $p\equiv 1\pmod{4}$
32803
Prove that if b is coprime to 6 then $b^2 \equiv 1 $ (mod 24)
91565
How to efficiently compute $\,25^{37}\pmod{55}$?
97303
Calculate the multiplicative inverse modulo a composite number
10105
Proving $\, a^b = (a\bmod n)^b\, \pmod{\!n}\ $ [Congruence Power Rule]
121122
Calculate $2^{5104} \bmod 10$ using mental arithmetic
66161
How to solve the equation $n^2 \equiv 0 \pmod{584}$?
22029
Solving modular arithmetic questions
4475
Find the remainder when $2^{2016}$ is divided by $47$
94855
Prove if a (mod n) has a multiplicative inverse, then it's unique
43453
Is ${\sqrt2^{\sqrt2^{\sqrt2^{\sqrt2^\sqrt2}}}}^{...}=4$ correct?
38727
Modular Exponentiation and Primes
19449
What is $48\div2(9+3)$?
157771
Nested exponent modulus, $2^{2^{517}} \pmod {23}$
147665
$a_1=3;\ a_{n+1}=3^{a_n}$; find $a_{2004}\bmod100$
10889
Mod[1.2, 0.2] is not equal to zero