Numbers k such that k and k^2 use only the digits 0, 3, 6, 8 and 9.

Terms

a(0) =0a(1) =3a(2) =6a(3) =30a(4) =60a(5) =63a(6) =83a(7) =300a(8) =306a(9) =600a(10) =603a(11) =630a(12) =830a(13) =833a(14) =836a(15) =3000a(16) =3006a(17) =3060a(18) =6000a(19) =6003a(20) =6030a(21) =6300a(22) =8300a(23) =8303a(24) =8306a(25) =8330a(26) =8360a(27) =9386a(28) =9803a(29) =30000