Squares which repeat with at least two full periods when written in base 3.

Terms

a(0) =4a(1) =121a(2) =841a(3) =6889a(4) =60025a(5) =62001a(6) =68644a(7) =534361a(8) =540225a(9) =1042441a(10) =4791721a(11) =4809249a(12) =20811844a(13) =43072969a(14) =43125489a(15) =43283241a(16) =387499225a(17) =387656721a(18) =388129401a(19) =567725929a(20) =713584369a(21) =1255284900a(22) =2231617600a(23) =3487020601a(24) =3487493025a(25) =3488910489a(26) =31381768201