2257687domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of partitions in expanding space: sigma(n,q) is the sum of the q-th powers of the divisors of n.at n=8A023881Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of exp(Sum_{j>0} sigma_k(j)*x^j/j) in powers of x.at n=44A294946Prime numbersat n=166609