Numbers whose base-12 representation has the same nonzero number of 3's and 7's.

Terms

a(0) =43a(1) =87a(2) =187a(3) =231a(4) =331a(5) =375a(6) =439a(7) =451a(8) =463a(9) =487a(10) =499a(11) =511a(12) =516a(13) =517a(14) =518a(15) =520a(16) =521a(17) =522a(18) =524a(19) =525a(20) =526a(21) =527a(22) =535a(23) =547a(24) =559a(25) =571a(26) =619a(27) =663a(28) =763a(29) =807