Numbers whose base-12 representation has the same nonzero number of 3's and 9's.

Terms

a(0) =45a(1) =111a(2) =189a(3) =255a(4) =333a(5) =399a(6) =441a(7) =453a(8) =465a(9) =489a(10) =501a(11) =513a(12) =525a(13) =537a(14) =540a(15) =541a(16) =542a(17) =544a(18) =545a(19) =546a(20) =547a(21) =548a(22) =550a(23) =551a(24) =561a(25) =573a(26) =621a(27) =687a(28) =765a(29) =831