Liouville's function: parity of number of primes dividing n (with multiplicity).

Terms

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