Smallest square that remains a square when prefixed with n.

Terms

a(0) =225a(1) =25a(2) =4225a(3) =9a(4) =625a(5) =4a(6) =225a(7) =1a(8) =3025a(9) =5625a(10) =9025a(11) =1a(12) =225a(13) =4a(14) =625a(15) =9a(16) =64a(17) =49a(18) =36a(19) =25a(20) =16a(21) =5625a(22) =87025a(23) =8850625a(26) =225a(27) =9a(28) =16a(29) =25a(30) =36a(31) =4