Primes p such that phi(p-3) = phi(phi(p-1)-1).

Terms

a(0) =5a(1) =17a(2) =257a(3) =1277a(4) =3853a(5) =6203a(6) =8663a(7) =16481a(8) =65537a(9) =131519a(10) =257953a(11) =265961a(12) =269573a(13) =380201a(14) =510449a(15) =512927a(16) =846563a(17) =904793a(18) =1056707a(19) =1503329a(20) =1538057a(21) =2675753a(22) =2756153a(23) =2952413a(24) =3333893a(25) =3837347a(26) =4457753a(27) =4643213a(28) =4783873a(29) =5068937