Numbers k such that 27*2^k-1 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =10a(6) =14a(7) =28a(8) =37a(9) =38a(10) =70a(11) =121a(12) =122a(13) =160a(14) =170a(15) =253a(16) =329a(17) =362a(18) =454a(19) =485a(20) =500a(21) =574a(22) =892a(23) =962a(24) =1213a(25) =1580a(26) =2642a(27) =2708a(28) =4505a(29) =8152