532180domain: NAppears in sequencesSums of 4 distinct powers of 9.at n=16A038489a(n) = Sum_{d|n} d^tau(d).at n=26A174937Sum of increasing powers of divisors: a(n) = Sum_{i=1..q} d(i)^i where d(1) < d(2) < ... < d(q) are the divisors of n.at n=26A180851