Numbers k such that k and k^3 use only even digits.

Terms

a(0) =0a(1) =2a(2) =4a(3) =20a(4) =40a(5) =200a(6) =202a(7) =400a(8) =2000a(9) =2002a(10) =2020a(11) =4000a(12) =20000a(13) =20002a(14) =20020a(15) =20200a(16) =40000a(17) =200000a(18) =200002a(19) =200020a(20) =200200a(21) =202000a(22) =400000a(23) =2000000a(24) =2000002a(25) =2000020a(26) =2000200a(27) =2002000a(28) =2020000a(29) =4000000