Multiples of 3 written in base 2.

Terms

a(0) =0a(1) =11a(2) =110a(3) =1001a(4) =1100a(5) =1111a(6) =10010a(7) =10101a(8) =11000a(9) =11011a(10) =11110a(11) =100001a(12) =100100a(13) =100111a(14) =101010a(15) =101101a(16) =110000a(17) =110011a(18) =110110a(19) =111001a(20) =111100a(21) =111111a(22) =1000010a(23) =1000101a(24) =1001000a(25) =1001011a(26) =1001110a(27) =1010001a(28) =1010100a(29) =1010111