Artin's conjecture on primitive roots: Part Ii Power Squarefree Part Not Modeq One

Artin's Conjecture on Primitive Roots*, second half, power version If $a = b^m$ is a perfect odd power of a number $b$ whose squarefree part $b_0\not\equiv 1 \pmod{4}$, then the density of the set $S(a)$ of primes $p$ such that $a$ is a primitive root modulo $p$ is given by $C\prod_{p \mid m} \frac{p(p - 2)}{p^2 - p - 1}$, where $C$ is Artin's constant.