Smallest nontrivial extension of n which is a square.

Terms

a(0) =16a(1) =25a(2) =36a(3) =49a(4) =529a(5) =64a(6) =729a(7) =81a(8) =900a(9) =100a(10) =1156a(11) =121a(12) =1369a(13) =144a(14) =1521a(15) =169a(16) =1764a(17) =1849a(18) =196a(19) =2025a(20) =2116a(21) =225a(22) =2304a(23) =2401a(24) =256a(25) =2601a(26) =2704a(27) =289a(28) =2916a(29) =3025