Squares that remain squares when prefixed with a 3.

Terms

a(0) =4225a(1) =30625a(2) =330625a(3) =422500a(4) =3062500a(5) =4515625a(6) =33062500a(7) =42250000a(8) =306250000a(9) =451562500a(10) =953265625a(11) =3306250000a(12) =4225000000a(13) =30625000000a(14) =39451890625a(15) =45156250000a(16) =95326562500a(17) =282891015625a(18) =330625000000a(19) =422500000000