20701400904domain: NAppears in sequencesa(n) = sigma_9(n), the sum of the 9th powers of the divisors of n.at n=13A013957E.g.f. Sum_{d|M} (exp(d*x)-1)/d, M=14.at n=10A141013Sum of the 9th powers of the squarefree divisors of n.at n=13A351272a(n) = n^9 * Product_{p|n, p prime} (1 + 1/p^9).at n=13A351304