148960

Appears in sequences

• (1+e)-harmonic numbers: harmonic mean of (1+e)-divisors is an integer.at n=19A053783
• Numbers n such that (n(n+1)/2) modulo sigma(n) = n.at n=18A232538
• a(n) is the least number k > n such that h(k)/h(n) is an integer, where h(n) is the harmonic mean of the divisors of n, or -1 if no such k exists.at n=39A353691
• Numbers k such that (sigma(k) - k)^(sigma(k) - k) == k (mod sigma(k)), where sigma = A000203.at n=31A375790
• a(n) = 7*n^3 - 6*n^2.at n=27A382251