Primes p such that pi(p) divides p-1 and/or p+1, where pi(p) is the number of primes <= p.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =29a(7) =37a(8) =43a(9) =349a(10) =359a(11) =1087a(12) =1091a(13) =3079a(14) =8423a(15) =64579a(16) =64591a(17) =64601a(18) =64609a(19) =64661a(20) =64709a(21) =481043a(22) =481067a(23) =1304707a(24) =3523969a(25) =3524249a(26) =3524317a(27) =3524387a(28) =9558541a(29) =9559799