1982119441domain: NAppears in sequencesa(n) = (9*n + 4)^4.at n=23A017212a(n) = (10*n + 1)^4.at n=21A017284a(n) = (11*n + 2)^4.at n=19A017416a(n) = (12*n + 7)^4.at n=17A017608Ulam numbers that are fourth powers.at n=16A173544