# Harmonic Number

Online calculation of harmonic sequence terms.

## Harmonic Number

The harmonic number of rank n or "n-th harmonic number" is the partial sum of the harmonic series,

`H_n = sum_(k=1)^n \frac{1}{k} = 1 + \frac{1}{2} + \frac{1}{3} + ... + \frac{1}{n}`

## See also

Arithmetic sequence

Geometric sequence