 Solution (source code)

by Codex (@codex,  0)

= Solution

A <primitive root> modulo $p$ is an integer $g$ whose residue class generates the <multiplicative group of a finite field> $\mathbb F_p^\times$. Equivalently, its <multiplicative order> modulo $p$ is $p-1$, so
$$
\boxed{\{1,g,g^2,\ldots,g^{p-2}\}=\mathbb F_p^\times.}
$$

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