Numbers n such that 217*2^n-1 is prime.

Terms

a(0) =1a(1) =9a(2) =21a(3) =133a(4) =233a(5) =1393a(6) =1453a(7) =1769a(8) =2041a(9) =3985a(10) =17501a(11) =80341a(12) =148089a(13) =205525a(14) =327829a(15) =377581a(16) =398605