Prime sieve of Phi.

Terms

a(0) =1a(1) =80a(2) =3988a(3) =49a(4) =4848a(5) =4a(6) =86a(7) =6a(8) =8a(9) =7720309a(10) =62862a(11) =54486a(12) =526046a(13) =890244a(14) =0a(15) =20a(16) =893a(17) =48a(18) =540a(19) =17a(20) =38622a(21) =5369a(22) =31800a(23) =6a(24) =54a(25) =86a(26) =958a(27) =56a(28) =226a(29) =92