Numbers whose set of base-7 digits is {1,2}.

Terms

a(0) =1a(1) =2a(2) =8a(3) =9a(4) =15a(5) =16a(6) =57a(7) =58a(8) =64a(9) =65a(10) =106a(11) =107a(12) =113a(13) =114a(14) =400a(15) =401a(16) =407a(17) =408a(18) =449a(19) =450a(20) =456a(21) =457a(22) =743a(23) =744a(24) =750a(25) =751a(26) =792a(27) =793a(28) =799a(29) =800