Characteristic function of nonprimes: 0 if n is prime, else 1.

Terms

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