phi(a(n)) is equal to the multiplicative projection of (a(n)-1).

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =9a(5) =11a(6) =13a(7) =23a(8) =29a(9) =31a(10) =43a(11) =47a(12) =53a(13) =59a(14) =61a(15) =67a(16) =71a(17) =79a(18) =83a(19) =103a(20) =107a(21) =131a(22) =139a(23) =149a(24) =157a(25) =167a(26) =173a(27) =179a(28) =191a(29) =211