Wolstenholme number

In mathematics, a Wolstenholme number is a number that is the numerator of the generalized harmonic number H_n,2.

The first such numbers are 1, 5, 49, 205, 5269, 5369, 266681, 1077749, ... (sequence A007406 in the OEIS).

These numbers are named after Joseph Wolstenholme, who proved Wolstenholme's theorem on modular relations of the generalized harmonic numbers.