Numbers whose base-2 and base-7 expansions have no digits in common.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =16a(6) =17a(7) =18a(8) =19a(9) =20a(10) =23a(11) =24a(12) =25a(13) =26a(14) =27a(15) =30a(16) =31a(17) =32a(18) =33a(19) =34a(20) =37a(21) =38a(22) =39a(23) =40a(24) =41a(25) =44a(26) =45a(27) =46a(28) =47a(29) =48