Squares that remains a square when some single digit is inserted in front of its decimal expansion.

Terms

a(0) =1a(1) =4a(2) =9a(3) =25a(4) =100a(5) =225a(6) =400a(7) =625a(8) =900a(9) =1225a(10) =2025a(11) =2500a(12) =3025a(13) =4225a(14) =5625a(15) =7225a(16) =10000a(17) =22500a(18) =30625a(19) =40000a(20) =50625a(21) =62500a(22) =70225a(23) =75625a(24) =90000a(25) =93025a(26) =122500a(27) =202500a(28) =250000a(29) =302500