Squares whose decimal expansion contains no digit greater than 4.

Terms

a(0) =0a(1) =1a(2) =4a(3) =100a(4) =121a(5) =144a(6) =324a(7) =400a(8) =441a(9) =1024a(10) =1444a(11) =2304a(12) =2401a(13) =10000a(14) =10201a(15) =10404a(16) =12100a(17) =12321a(18) =14400a(19) =22201a(20) =23104a(21) =32041a(22) =32400a(23) =33124a(24) =40000a(25) =40401a(26) =44100a(27) =101124a(28) =102400a(29) =103041