1766100625domain: NAppears in sequencesa(n) = (10*n + 5)^4.at n=20A017332a(n) = (11*n + 7)^4.at n=18A017476a(n) = (12*n + 1)^4.at n=17A017536RF(5): refactorable numbers with smallest prime factor 5.at n=12A120320Ulam numbers that are fourth powers.at n=14A173544