Numbers k such that 15*2^k - 1 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =10a(5) =14a(6) =17a(7) =31a(8) =41a(9) =73a(10) =80a(11) =82a(12) =116a(13) =125a(14) =145a(15) =157a(16) =172a(17) =202a(18) =224a(19) =266a(20) =289a(21) =293a(22) =463a(23) =1004a(24) =1246a(25) =2066a(26) =2431a(27) =2705a(28) =4622a(29) =5270