44569782domain: NAppears in sequencesa(n) = n^6 - n^5.at n=19A085539a(n) = p^5*(p-1) where p = prime(n).at n=7A138412a(n) = phi(n^6) = n^5*phi(n).at n=18A306411a(n) is the number of numbers of the form k + reverse(k) for at least one n-digit number k.at n=11A358985