Harmonic Number

The $n$-th harmonic number $H_n$ is: ¹

$$H_n=1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{n}=\sum _{k=1}^n\frac{1}{k}$$

In Haskell: ¹

harmonicNumber n = sum [ 1.0 / (fromIntegral k) | k <- [1..n] ]

Footnotes

1. 20250419063935 ↩ ↩²