Numbers n such that the decimal number concat(2,n) is a square.

Terms

a(0) =5a(1) =25a(2) =56a(3) =89a(4) =116a(5) =209a(6) =304a(7) =401a(8) =500a(9) =601a(10) =704a(11) =809a(12) =916a(13) =1025a(14) =1316a(15) =1609a(16) =1904a(17) =2201a(18) =2500a(19) =2801a(20) =3104a(21) =3409a(22) =3716a(23) =4025a(24) =4336a(25) =4649a(26) =4964a(27) =5281a(28) =5600a(29) =5921