Binary encoding of A006881, numbers with two distinct prime divisors.

Terms

a(0) =3a(1) =5a(2) =9a(3) =6a(4) =10a(5) =17a(6) =33a(7) =18a(8) =65a(9) =12a(10) =129a(11) =34a(12) =257a(13) =66a(14) =20a(15) =130a(16) =513a(17) =1025a(18) =36a(19) =258a(20) =2049a(21) =24a(22) =4097a(23) =68a(24) =8193a(25) =514a(26) =40a(27) =1026a(28) =16385a(29) =132