Meaning of congruence (in twin prime criterion)
7043
mod [= remainder] operation (and relation), name and meaning
56229
On the difference between consecutive primes
108035
solving diophantine equations using congruences
13111
What does this $\asymp$ symbol mean? (subject: analytic number theory)
1712
$ d_1,d_2\mid n\iff {\rm lcm}(d_1,d_2)\mid n\ $ [LCM Universal Property]
11989
$ac\equiv bc \pmod{\!m}\!\!\iff\!\! a\equiv b \pmod{\!\!\frac{m}{(c,m)}}$ [Euclid's Lemma, congruence form]
20630
Digital root of twin prime semiprimes
97196
$k^{\phi(l)} + l^{\phi(k)} \equiv1\pmod{lk}\,$ if $\,\gcd(l,k)=1$
60804
About the property of $m$: if $n < m$ is co-prime to $m$, then $n$ is prime
17233
are two consecutive numbers relatively prime?
36713
Solving multiple congruences by CRT = Chinese Remainder Theorem
131241
primes congruent to 5 mod 6 and 1 mod p
56803
Finding solutions to congruence equations
106313
How Does Modulus Divison Work
19761
Show for prime numbers of the form $p=4n+1$,  $x=(2n)!$ solves the congruence $x^2\equiv-1 \pmod p$. $p$ is therefore not a gaussian prime.
92737
primes whose difference is a multiple of $n$
6918
Primes congruent to 1 mod 6