Dirichlet inverse of Euler totient function (A000010).

Terms

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