Squares composed of digits {2,5,6}.

Terms

a(0) =25a(1) =225a(2) =256a(3) =625a(4) =5625a(5) =55225a(6) =225625a(7) =265225a(8) =266256a(9) =525625a(10) =26265625a(11) =56625625a(12) =525555625a(13) =556252225a(14) =5252625625a(15) =255555525625a(16) =265652622225