Numbers k such that k and k^2 use only the digits 0, 3, 4, 6 and 8.

Terms

a(0) =0a(1) =6a(2) =8a(3) =60a(4) =80a(5) =600a(6) =800a(7) =6000a(8) =6638a(9) =6808a(10) =6844a(11) =8000a(12) =60000a(13) =60406a(14) =60688a(15) =66380a(16) =66808a(17) =68080a(18) =68440a(19) =80000a(20) =600000a(21) =604060a(22) =606880a(23) =663800a(24) =668080a(25) =680800a(26) =684400a(27) =800000a(28) =6000000a(29) =6003406