Numbers whose base-7 and base-10 expansions have no digits in common.

Terms

a(0) =7a(1) =8a(2) =9a(3) =14a(4) =16a(5) =17a(6) =18a(7) =19a(8) =21a(9) =22a(10) =24a(11) =25a(12) =26a(13) =27a(14) =28a(15) =29a(16) =30a(17) =32a(18) =33a(19) =36a(20) =37a(21) =39a(22) =40a(23) =41a(24) =42a(25) =43a(26) =44a(27) =45a(28) =47a(29) =48