Primes of the form p^k - p + 1 for prime p.

Terms

a(0) =3a(1) =7a(2) =31a(3) =43a(4) =79a(5) =127a(6) =157a(7) =241a(8) =337a(9) =727a(10) =1321a(11) =3121a(12) =4423a(13) =6163a(14) =6841a(15) =8191a(16) =19183a(17) =19681a(18) =22651a(19) =26407a(20) =28549a(21) =29761a(22) =37057a(23) =68881a(24) =78121a(25) =113233a(26) =117643a(27) =121453a(28) =130303a(29) =131071