Numbers whose base-6 representation has the same number of 1's and 3's.

Terms

a(0) =0a(1) =2a(2) =4a(3) =5a(4) =9a(5) =12a(6) =14a(7) =16a(8) =17a(9) =19a(10) =24a(11) =26a(12) =28a(13) =29a(14) =30a(15) =32a(16) =34a(17) =35a(18) =39a(19) =51a(20) =54a(21) =56a(22) =58a(23) =59a(24) =63a(25) =69a(26) =72a(27) =74a(28) =76a(29) =77