calculating $a^b \!\mod c$
360
Modular exponentiation by hand ($a^b\bmod c$)
152039
Prove that $a^{2^n}=1 \mod 2^{n+2}$
72360
Find the value of $a^{2m}+a^m+{1\over a^m}+{1\over a^{2m}}$
136367
Prove $ ∀a, b, c ∈ Z,$ if $ab + ac ≡ 3$ (mod 6) then b $\not\equiv$ c (mod 6).
68960
How to solve $ 13x \equiv 1 ~ (\text{mod} ~ 17) $?
101057
Show that $1^{p-1} + 2^{p-1} +\ldots + (p-1)^{p-1} \equiv -1 \mod p$
5287
Representing every positive rational number in the form of $(a^n+b^n)/(c^n+d^n)$
108237
Show $a^p \equiv b^p \mod p^2$
119433
How to find modulo of large numbers like $9801\! \pmod {\!32}$
4435
What does $\!\bmod(n,x^r-1)$ mean? [in AKS primality test]
14668
complex number question involving modulus
151636
Fast way to calculate n! mod m where m is prime?
24499
Finding $(a, b, c)$ with $ab-c$, $bc-a$, and $ca-b$ being powers of $2$
148671
Trying to factor $x^4-3$ over $\Bbb{F}_p$ with $p\equiv 3\mod{4}$
23153
$\bmod p\!:\ x^2\equiv 1\iff x\equiv \pm1\ $ for prime $p$
96927
Modus Operandi. Formulae for Maximum and Minimum of two numbers with a + b and $|a - b|$
33105
Find the value of $a^2-b^2+c^2$