Primes p such that phi(p-2) = phi(p-1).

Terms

a(0) =3a(1) =5a(2) =17a(3) =257a(4) =977a(5) =3257a(6) =5189a(7) =11717a(8) =13367a(9) =22937a(10) =65537a(11) =307397a(12) =491537a(13) =589409a(14) =983777a(15) =1659587a(16) =2822717a(17) =3137357a(18) =5577827a(19) =6475457a(20) =7378373a(21) =8698097a(22) =10798727a(23) =32235737a(24) =37797437a(25) =39220127a(26) =39285437a(27) =51555137a(28) =52077197a(29) =56992553