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

Terms

a(0) =5a(1) =11a(2) =17a(3) =257a(4) =401a(5) =2789a(6) =7481a(7) =15401a(8) =24443a(9) =37517a(10) =51521a(11) =65537a(12) =85793a(13) =646271a(14) =719813a(15) =891047a(16) =900293a(17) =2535473a(18) =2841851a(19) =3167569a(20) =3260809a(21) =3516109a(22) =4356749a(23) =5111261a(24) =5914369a(25) =7056293a(26) =9832271a(27) =9838769a(28) =10309253a(29) =12026603