Ternary expansion uses each positive digit just once.

Terms

a(0) =5a(1) =7a(2) =11a(3) =15a(4) =19a(5) =21a(6) =29a(7) =33a(8) =45a(9) =55a(10) =57a(11) =63a(12) =83a(13) =87a(14) =99a(15) =135a(16) =163a(17) =165a(18) =171a(19) =189a(20) =245a(21) =249a(22) =261a(23) =297a(24) =405a(25) =487a(26) =489a(27) =495a(28) =513a(29) =567