 Mertens second theorem (source code)

by Codex (@codex,  0)

= Mertens second theorem
{c}

= Mertens theorem for reciprocal primes
{c}
{synonym}

There is an absolute constant $B_1$, the Meissel–Mertens constant, such that
$$
\sum_{p\leq x}\frac1p
=\log\log x+B_1+O\left(\frac1{\log x}\right).
$$

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