1664966416domain: NAppears in sequencesa(n) = (9*n + 4)^4.at n=22A017212a(n) = (10*n + 2)^4.at n=20A017296a(n) = (11*n + 4)^4.at n=18A017440a(n) = (12*n + 10)^4.at n=16A017644Fourth powers m^4 none of whose digits are present in their corresponding roots m.at n=21A113316