Numbers whose base-9 representation has the same nonzero number of 0's and 6's.

Terms

a(0) =54a(1) =87a(2) =135a(3) =168a(4) =216a(5) =249a(6) =297a(7) =330a(8) =378a(9) =411a(10) =459a(11) =487a(12) =488a(13) =489a(14) =490a(15) =491a(16) =493a(17) =494a(18) =495a(19) =504a(20) =513a(21) =522a(22) =531a(23) =549a(24) =558a(25) =573a(26) =621a(27) =654a(28) =702a(29) =744