Numbers k such that 231*2^k+1 is prime.

Terms

a(0) =1a(1) =4a(2) =5a(3) =7a(4) =9a(5) =11a(6) =12a(7) =13a(8) =15a(9) =27a(10) =33a(11) =65a(12) =85a(13) =89a(14) =105a(15) =120a(16) =149a(17) =161a(18) =175a(19) =229a(20) =279a(21) =295a(22) =307a(23) =355a(24) =453a(25) =528a(26) =625a(27) =697a(28) =807a(29) =831