34883654domain: NAppears in sequencesNumbers n such that Product_{d|n} sigma(d) = Product_{d|n+1} sigma(d).at n=33A280087Numbers m such that the delta(m) = abs(h(m+1) - h(m)) is smaller than delta(k) for all k < m, where h(m) is the harmonic mean of the divisors of m.at n=12A335291