Numbers k such that k and k^2 use only the digits 0, 3, 5, 6 and 8.

Terms

a(0) =0a(1) =6a(2) =60a(3) =600a(4) =6000a(5) =8066a(6) =60000a(7) =60666a(8) =80660a(9) =550506a(10) =555566a(11) =600000a(12) =603066a(13) =606660a(14) =806600a(15) =5505060a(16) =5555660a(17) =6000000a(18) =6030660a(19) =6066600a(20) =8066000a(21) =55050600a(22) =55556600a(23) =60000000a(24) =60306600a(25) =60553006a(26) =60666000a(27) =80660000a(28) =80830306a(29) =550506000