Squares that remain squares when prefixed with an 8.

Terms

a(0) =1a(1) =100a(2) =1225a(3) =10000a(4) =93025a(5) =122500a(6) =1000000a(7) =9302500a(8) =12250000a(9) =100000000a(10) =930250000a(11) =1225000000a(12) =10000000000a(13) =14731890625a(14) =93025000000a(15) =122500000000a(16) =863273265625a(17) =1000000000000