Numbers whose binary expansion does not begin 111.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =8a(8) =9a(9) =10a(10) =11a(11) =12a(12) =13a(13) =16a(14) =17a(15) =18a(16) =19a(17) =20a(18) =21a(19) =22a(20) =23a(21) =24a(22) =25a(23) =26a(24) =27a(25) =32a(26) =33a(27) =34a(28) =35a(29) =36