1692563domain: NPropertiesPrimalityPrimeyesAppears in sequencesExpansion of e.g.f. 1/(3 - exp(x) - exp(2*x)).at n=6A004700Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of e.g.f. 1/(1 + k - Sum_{j=1..k} exp(j*x)).at n=42A320253Prime numbersat n=127610