Primes of the form p^k - p^(k-1) - 1, with p prime and k>1.

Terms

a(0) =3a(1) =5a(2) =7a(3) =17a(4) =19a(5) =31a(6) =41a(7) =53a(8) =109a(9) =127a(10) =271a(11) =293a(12) =499a(13) =811a(14) =929a(15) =2027a(16) =2161a(17) =3659a(18) =4373a(19) =4421a(20) =4969a(21) =8191a(22) =9311a(23) =10099a(24) =13121a(25) =13309a(26) =16001a(27) =17029a(28) =19181a(29) =22051