It is well known that the sum of the primitive roots modulo $p$ is congruent to $\mu(p − 1) \bmod{p}$.
But I can't see why this result is interesting or useful. Can someone please enlighten me?
It is well known that the sum of the primitive roots modulo $p$ is congruent to $\mu(p − 1) \bmod{p}$.
But I can't see why this result is interesting or useful. Can someone please enlighten me?