Multiplicative with a(p^e) = -p.

Terms

a(0) =1a(1) =-2a(2) =-3a(3) =-2a(4) =-5a(5) =6a(6) =-7a(7) =-2a(8) =-3a(9) =10a(10) =-11a(11) =6a(12) =-13a(13) =14a(14) =15a(15) =-2a(16) =-17a(17) =6a(18) =-19a(19) =10a(20) =21a(21) =22a(22) =-23a(23) =6a(24) =-5a(25) =26a(26) =-3a(27) =14a(28) =-29a(29) =-30