Number of solutions to phi(k) = 2n.

Terms

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