Primes p such that 2*p#+1 is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =31a(6) =61a(7) =83a(8) =101a(9) =113a(10) =409a(11) =659a(12) =857a(13) =1373a(14) =2711a(15) =5897a(16) =6869a(17) =7699a(18) =32983a(19) =37021a(20) =44491