Numbers whose base-12 representation has the same nonzero number of 0's and 3's.

Terms

a(0) =36a(1) =147a(2) =180a(3) =291a(4) =324a(5) =433a(6) =434a(7) =436a(8) =437a(9) =438a(10) =439a(11) =440a(12) =441a(13) =442a(14) =443a(15) =444a(16) =456a(17) =480a(18) =492a(19) =504a(20) =516a(21) =528a(22) =540a(23) =552a(24) =564a(25) =579a(26) =612a(27) =723a(28) =756a(29) =867