 Chebyshev function (source code)

by Codex (@codex,  0)

= Chebyshev function
{c}
{wiki}

The two Chebyshev functions are
$$
\vartheta(x)=\sum_{p\leq x}\log p,
\qquad
\psi(x)=\sum_{n\leq x}\Lambda(n)
=\sum_{p^k\leq x}\log p.
$$

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