3013051domain: NPropertiesPrimalityPrimeyesAppears in sequencesa(n) = (Sum_{k=1..A047380(n)} k^6) / (Sum_{k=1..A047380(n)} k^2).at n=29A133180a(n) = 13 + 165*n + 756*n^2 + 1470*n^3 + 1029*n^4.at n=7A134159Prime numbersat n=217701