Artin's conjecture on primitive roots

Statement

Infinitude version

Suppose $a$ is an integer that is not equal to $-1$ and is not a perfect square, i.e., $a$ is not the square of an integer. Then, there exist infinitely many primes $p$ such that $a$ is a primitive root modulo Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle p} .