# Harmonic Series

Needed to be familiar with this concept for this codeforces problem https://codeforces.com/problemset/problem/1996/D to prove that we can find $b$ in a reasonable time

In mathematics, the harmonic series is the infinite series formed by summing all positive unit fractions: $n=1∑∞ n1 =1+21 +31 +41 +51 +⋯$

It is a divergent series.

The first $N$ terms of the series sums to approximately $∑_{n=1}n1 ≈lnN+2N1 +γ$ where

- $γ≈0.577$