Semiprimes written in base 2.

Terms

a(0) =100a(1) =110a(2) =1001a(3) =1010a(4) =1110a(5) =1111a(6) =10101a(7) =10110a(8) =11001a(9) =11010a(10) =100001a(11) =100010a(12) =100011a(13) =100110a(14) =100111a(15) =101110a(16) =110001a(17) =110011a(18) =110111a(19) =111001a(20) =111010a(21) =111110a(22) =1000001a(23) =1000101a(24) =1001010a(25) =1001101a(26) =1010010a(27) =1010101a(28) =1010110a(29) =1010111