798768domain: NAppears in sequencesa(n) = 2^n for n = 0..4; for n > 4, a(n) = 2*a(n-1) + a(n-5).at n=19A098588Powerful numbers (A001694) which can be written as the sum of two relatively prime 3-powerful numbers (A036966) different from 1.at n=22A210470Powerful numbers of the form x^3 + y^3 with x and y coprime.at n=7A238120