Number of distinct primes = 3 mod 4 dividing n.

Terms

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