Numbers whose base-8 representation has the same nonzero number of 3's and 7's.

Terms

a(0) =31a(1) =59a(2) =95a(3) =123a(4) =159a(5) =187a(6) =199a(7) =207a(8) =215a(9) =231a(10) =239a(11) =247a(12) =248a(13) =249a(14) =250a(15) =252a(16) =253a(17) =254a(18) =287a(19) =315a(20) =351a(21) =379a(22) =415a(23) =443a(24) =451a(25) =459a(26) =467a(27) =472a(28) =473a(29) =474