47419domain: NPropertiesPrimalityPrimeyesAppears in sequencesQuadruple lucky numbers (lower terms). Numbers n such that n, n+2, n+6, n+8 are all Lucky numbers.at n=33A139783a(n) = Sum_{d|n} (n/d)^(n/d) * binomial(d+n-1,n).at n=5A343568Prime numbersat n=4890