Primes prime(k) such that 2^(k-1) - prime(k) is also prime.

Terms

a(0) =11a(1) =13a(2) =17a(3) =19a(4) =23a(5) =37a(6) =61a(7) =233a(8) =257a(9) =1553a(10) =2879a(11) =4919a(12) =6389a(13) =7621a(14) =8081a(15) =35593a(16) =37951a(17) =96263a(18) =206419a(19) =596803a(20) =1202837a(21) =2837851