a(n) is 1 if and only if Ramanujan's tau(n) > 0.

Terms

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