13871719domain: NAppears in sequencesNumerator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.at n=18A072980Numerator of b(n) = Sum_{k'<=n} 1/k', where k' denotes the squarefree numbers.at n=19A072980a(n) is the numerator of the sum of the reciprocals of the first n squarefree numbers.at n=12A354417