Numbers whose base-6 representation has the same number of 0's, 1's and 2's.

Terms

a(0) =3a(1) =4a(2) =5a(3) =21a(4) =22a(5) =23a(6) =27a(7) =28a(8) =29a(9) =33a(10) =34a(11) =35a(12) =38a(13) =48a(14) =73a(15) =78a(16) =129a(17) =130a(18) =131a(19) =135a(20) =136a(21) =137a(22) =141a(23) =142a(24) =143a(25) =165a(26) =166a(27) =167a(28) =171a(29) =172