344022domain: NAppears in sequencesSmallest number m such that sigma(m) is an n-almost prime.at n=18A152092The smallest superharmonic number with index n.at n=13A152573Least k such that n divides d(sigma(k)) (d = A000005).at n=37A276043Even integers k such that phi(sum of even divisors of k) = sum of odd divisors of k.at n=20A281707