Numbers k such that 13*2^k - 1 is prime.

Terms

a(0) =3a(1) =7a(2) =23a(3) =287a(4) =291a(5) =795a(6) =2203a(7) =5711a(8) =7927a(9) =9443a(10) =10095a(11) =19071a(12) =29611a(13) =34651a(14) =51875a(15) =55343a(16) =77511a(17) =166303a(18) =233207