Squares whose sum and number of digits are also squares.

Terms

a(0) =0a(1) =1a(2) =4a(3) =9a(4) =1521a(5) =1681a(6) =2025a(7) =2304a(8) =2601a(9) =3364a(10) =3481a(11) =3600a(12) =4489a(13) =4624a(14) =5776a(15) =5929a(16) =7225a(17) =7396a(18) =8100a(19) =8836a(20) =9025a(21) =100000000a(22) =100020001a(23) =100040004a(24) =100060009a(25) =100080016a(26) =100100025a(27) =100200100a(28) =100220121a(29) =100240144