Numbers whose binary expansion does not contain 001.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =10a(10) =11a(11) =12a(12) =13a(13) =14a(14) =15a(15) =16a(16) =20a(17) =21a(18) =22a(19) =23a(20) =24a(21) =26a(22) =27a(23) =28a(24) =29a(25) =30a(26) =31a(27) =32a(28) =40a(29) =42