Reduced multiplicative residue modulo p
8623
Finite subgroups of the multiplicative group of a field are cyclic
20161
Prove that the multiplicative inverse of $a$ modulo $m$ exists if and only if $a$ and $m$ are coprime.
60057
number of quadratic residues in finite field
104484
Prove that $r$ is a primitive root modulo $p$ if and only if $r^{(p−1)/q}\not\equiv 1\pmod{p}$
131241
primes congruent to 5 mod 6 and 1 mod p
67332
Sum of two squares modulo p
41925
What is the distribution of primes modulo $n$?
43567
Some hints for "If a prime $p = n^2+5$, then $p\equiv 1\mod 10$ or $p\equiv 9\mod 10$"
127816
Number theory proof mod p
36713
Solving multiple congruences by CRT = Chinese Remainder Theorem
52530
There exists a prime congruent to $m$ mod $p$
152231
Computing the product of p/(p - 2) over the odd primes
29979
When is $-3$ a quadratic residue mod $p$?
63427
A Problem with Residue Theorem
360
Modular exponentiation by hand ($a^b\bmod c$)
102234
Show $a^p \equiv a \mod 2p$
117481
How to perform the modular reduce of Rijndael's finite field