Numbers whose base-9 representation has the same nonzero number of 5's and 6's.

Terms

a(0) =51a(1) =59a(2) =132a(3) =140a(4) =213a(5) =221a(6) =294a(7) =302a(8) =375a(9) =383a(10) =411a(11) =420a(12) =429a(13) =438a(14) =447a(15) =459a(16) =460a(17) =461a(18) =462a(19) =463a(20) =466a(21) =467a(22) =474a(23) =483a(24) =491a(25) =500a(26) =509a(27) =518a(28) =527a(29) =531