Number of numbers m with Euler phi(m) = n.

Terms

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