71677domain: NAppears in sequencesNumbers x such that sigma(x)-x divides x-1, other than prime powers.at n=17A059047a(n) = [x^n] 1/(1-x)^n * Product_{k=1..n} 1/(1-x^k).at n=9A292613Number of partitions of n with ten kinds of 1.at n=9A320756