Numbers n such that Sum_{i=1..j} 1/pn(i) - Sum_{i=1..k} 1/pd(i) is an integer, where pn are the prime factors of n and pd the prime factors of the arithmetic derivative of n, both counted with multiplicity.

A239491

Numbers n such that Sum_{i=1..j} 1/pn(i) - Sum_{i=1..k} 1/pd(i) is an integer, where pn are the prime factors of n and pd the prime factors of the arithmetic derivative of n, both counted with multiplicity.