40373290domain: NAppears in sequencesNumbers that are the sum of 2 positive 9th powers.at n=23A003391a(n) = 3^n + 7^n.at n=9A074608Sum of the 9th powers of the primes dividing n.at n=20A351197a(n) = n^9 * Sum_{p|n, p prime} 1/p^9.at n=20A351249