821142domain: NAppears in sequencesa(n) = (n + 1)*(n + 2)*(n + 4)*(n + 8)*(n + 15)/120.at n=34A006636a(n) = 7^n - n^4.at n=7A024079a(n) = prime(n)^prime(n) - prime(n)^n.at n=3A259654Numbers whose set of decimal digits coincides with the set of the indices of their prime factors.at n=10A318298