Numbers whose base-9 representation has the same nonzero number of 5's and 7's.

Terms

a(0) =52a(1) =68a(2) =133a(3) =149a(4) =214a(5) =230a(6) =295a(7) =311a(8) =376a(9) =392a(10) =412a(11) =421a(12) =430a(13) =439a(14) =448a(15) =466a(16) =468a(17) =469a(18) =470a(19) =471a(20) =472a(21) =474a(22) =476a(23) =484a(24) =538a(25) =554a(26) =572a(27) =581a(28) =590a(29) =599