Delete all 2's from the sequence of nonnegative integers.

Terms

a(0) =0a(1) =1a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =11a(11) =1a(12) =13a(13) =14a(14) =15a(15) =16a(16) =17a(17) =18a(18) =19a(19) =0a(20) =1a(21) =3a(22) =4a(23) =5a(24) =6a(25) =7a(26) =8a(27) =9a(28) =30a(29) =31