Squares which are the concatenation of two nonzero squares.

Terms

a(0) =49a(1) =169a(2) =361a(3) =1225a(4) =1444a(5) =1681a(6) =3249a(7) =4225a(8) =4900a(9) =15625a(10) =16900a(11) =36100a(12) =42025a(13) =49729a(14) =64009a(15) =81225a(16) =93025a(17) =122500a(18) =144400a(19) =168100a(20) =225625a(21) =237169a(22) =324900a(23) =422500a(24) =490000a(25) =519841a(26) =819025a(27) =950625a(28) =970225a(29) =1024144