Numbers whose base-8 representation has the same nonzero number of 1's and 7's.

Terms

a(0) =15a(1) =57a(2) =71a(3) =87a(4) =95a(5) =103a(6) =111a(7) =119a(8) =120a(9) =122a(10) =123a(11) =124a(12) =125a(13) =126a(14) =143a(15) =185a(16) =207a(17) =249a(18) =271a(19) =313a(20) =335a(21) =377a(22) =399a(23) =441a(24) =449a(25) =456a(26) =458a(27) =459a(28) =460a(29) =461