Numbers whose base-9 representation has the same nonzero number of 3's and 7's.

Terms

a(0) =34a(1) =66a(2) =115a(3) =147a(4) =196a(5) =228a(6) =250a(7) =259a(8) =268a(9) =286a(10) =295a(11) =304a(12) =306a(13) =307a(14) =308a(15) =310a(16) =311a(17) =312a(18) =314a(19) =322a(20) =358a(21) =390a(22) =439a(23) =471a(24) =520a(25) =552a(26) =570a(27) =579a(28) =588a(29) =594