Primes of the form 2*p^k-1, where p is prime and k > 1.

Terms

a(0) =7a(1) =17a(2) =31a(3) =53a(4) =97a(5) =127a(6) =241a(7) =337a(8) =577a(9) =1249a(10) =3361a(11) =3697a(12) =4373a(13) =4801a(14) =6961a(15) =8191a(16) =10657a(17) =13121a(18) =23761a(19) =25537a(20) =31249a(21) =32257a(22) =33613a(23) =37537a(24) =49297a(25) =59581a(26) =64081a(27) =65521a(28) =77617a(29) =79201