Numbers k such that 139*2^k-1 is prime.

Terms

a(0) =1a(1) =5a(2) =7a(3) =9a(4) =15a(5) =19a(6) =21a(7) =35a(8) =37a(9) =39a(10) =41a(11) =49a(12) =69a(13) =111a(14) =115a(15) =141a(16) =159a(17) =181a(18) =201a(19) =217a(20) =487a(21) =567a(22) =677a(23) =765a(24) =811a(25) =841a(26) =917a(27) =1279a(28) =1407a(29) =1505