Numbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 9.

Terms

a(0) =0a(1) =3a(2) =6a(3) =30a(4) =60a(5) =63a(6) =64a(7) =300a(8) =306a(9) =600a(10) =603a(11) =630a(12) =636a(13) =640a(14) =3000a(15) =3006a(16) =3060a(17) =6000a(18) =6003a(19) =6030a(20) =6300a(21) =6360a(22) =6400a(23) =6636a(24) =30000a(25) =30006a(26) =30060a(27) =30600a(28) =60000a(29) =60003