101179domain: NAppears in sequencesa(n) = sigma_3(n^3)/sigma(n^3).at n=6A077454Numbers k such that the last 9 digits of the k-th Lucas number are 1-9 pandigital.at n=30A216488a(2) = 0, and otherwise a(n) is the least multiple of prime(n+1) whose decimal representation ends with that of prime(n).at n=40A333577