Numbers k such that phi(k) = phi(k-2) - phi(k-1).

Terms

a(0) =195a(1) =3531a(2) =9339a(3) =27231a(4) =46795a(5) =78183a(6) =90195a(7) =112995a(8) =135015a(9) =437185a(10) =849405a(11) =935221a(12) =1078581a(13) =1283601a(14) =1986975a(15) =2209585a(16) =2341185a(17) =2411175a(18) =2689695a(19) =2744145a(20) =3619071a(21) =3712545a(22) =4738185a(23) =5132985a(24) =6596121a(25) =7829031a(26) =8184715a(27) =12176109