1171350625domain: NAppears in sequencesa(n) = (8*n + 1)^4.at n=23A017080a(n) = (10*n + 5)^4.at n=18A017332a(n) = (11*n + 9)^4.at n=16A017500a(n) = (12*n + 5)^4.at n=15A017584RF(5): refactorable numbers with smallest prime factor 5.at n=11A120320