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

Terms

a(0) =0a(1) =6a(2) =60a(3) =600a(4) =6000a(5) =60000a(6) =600000a(7) =6000000a(8) =60000000a(9) =600000000a(10) =2868603006a(11) =6000000000a(12) =6066368606a(13) =28686030060a(14) =60000000000a(15) =60002363606a(16) =60663686060a(17) =82866388606a(18) =286860300600a(19) =600000000000a(20) =600023636060a(21) =606636860600a(22) =828663886060