Numbers whose base-6 representation has the same number of 1's and 2's.

Terms

a(0) =0a(1) =3a(2) =4a(3) =5a(4) =8a(5) =13a(6) =18a(7) =21a(8) =22a(9) =23a(10) =24a(11) =27a(12) =28a(13) =29a(14) =30a(15) =33a(16) =34a(17) =35a(18) =38a(19) =48a(20) =51a(21) =52a(22) =53a(23) =56a(24) =62a(25) =68a(26) =73a(27) =78a(28) =81a(29) =82