Primitive root of unity, GCD-Identity
97469
How to prove $|a^k|=n/\gcd(n,k)$ whenever $|a|=n$?
31977
How to prove sum of powers property of roots of unity?
76126
How to find the GCD of two polynomials
94914
Concise proof that every common divisor divides GCD without Bezout's identity?
2614
Prove that , any primitive root $r$ of $p^n$ is also a primitive root of $p$
134916
When g and -g are both primitive roots
32136
How to prove Lucas's Converse of Fermat's Little Theorem without using primitive root?
1713
number theory $\gcd(a,bc)=\gcd(a,c)$
42165
Complex numbers and Roots of unity
34709
Complex numbers - roots of unity
31076
Roots of unity filter, identity involving $\sum_{k \ge 0} \binom{n}{3k}$
57592
Does existence of $\gcd$ implies PID?
7891
Sum of nth roots of unity
105975
Given the OneIdentity attribute why is GCD[a] evaluated to GCD[a]?
51858
Showing $\gcd(2^m-1,2^n+1)=1$
111199
Does there exist a formula for product of the primitive $ n $th roots of unity.
19164
On the GCD of a Pair of Fermat Numbers