Types of integer harmonic numbers (II)

Abstract

In the first part of this paper, we obtained several bi-unitary harmonic numbers which are higher than 10⁹, using the Mersenne prime numbers. In this paper, we investigate bi-unitary harmonic numbers of some particular forms: 2^{k .} n, pqt², p²q²t, with different primes p, q, t, and a squarefree integer n.