6660721domain: NPropertiesPrimalityPrimeyesAppears in sequencesExpansion of e.g.f. exp(x) / (1 - x^4).at n=11A330045a(n) = (4*n+3)! * Sum_{k=0..n} 1 / (4*k+3)!.at n=2A337730Prime numbersat n=455000