62496048domain: NAppears in sequencesComposite numbers k such that sum of the proper divisors of k is a power of 10.at n=10A235710Numbers k such that sigma(k) = concat(s,t) and k = s * t, where sigma(k) is the sum of the divisors of k.at n=20A272778Numbers k which are a substring of the base-10 representation of sigma(k).at n=1A390869