Primes p such that 2p-1 is also prime.

Terms

a(0) =2a(1) =3a(2) =7a(3) =19a(4) =31a(5) =37a(6) =79a(7) =97a(8) =139a(9) =157a(10) =199a(11) =211a(12) =229a(13) =271a(14) =307a(15) =331a(16) =337a(17) =367a(18) =379a(19) =439a(20) =499a(21) =547a(22) =577a(23) =601a(24) =607a(25) =619a(26) =661a(27) =691a(28) =727a(29) =811