primes congruent to +-1 (mod 6)
12365
Show that every prime $p>3$ is either of the form $6n+1$ or of the form $6n+5$
77430
Prove that every prime larger than $3$ gives a remainder of $1$ or $5$ if divided by $6$
99890
Primes with digits only 1
110695
Divisor of $2^{2^n} + 1$ modulus $2^{n+1}$
9787
Primitive roots modulo primes congruent to n!
127816
Number theory proof mod p
17660
Show that the odd prime divisors of $n^2+n+1$ are of form $6k+1$ (exclude 3)
41925
What is the distribution of primes modulo $n$?
91069
Express an even number as a sum of primes
42754
Modular arithmetic: division, fractions, solving linear congruences
36819
Show there are infinitely many primes that are equivalent to 1 mod 8.
101057
Show that $1^{p-1} + 2^{p-1} +\ldots + (p-1)^{p-1} \equiv -1 \mod p$
110809
What can primes, except 2, 3, and 5, be congruent to $\pmod {30}$?
146053
Proving identities (mod $pq$) using Fermat's little theorem?
132132
Are there infinitely many primes of the form $6^{2n}+1$ or only finitely many?
97303
Calculate the multiplicative inverse modulo a composite number
19071
solution set for congruence $x^2 \equiv 1 \mod m$