# Mertens' second theorem

> Theorem that the sum of 1/p for primes p up to n approximates log(log(n)) + M

**Wikidata**: [Q118176598](https://www.wikidata.org/wiki/Q118176598)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Mertens'_second_theorem)  
**Source**: https://4ort.xyz/entity/mertens-second-theorem