Numbers k such that 67*2^k-1 is prime.

Terms

a(0) =5a(1) =9a(2) =21a(3) =45a(4) =65a(5) =77a(6) =273a(7) =677a(8) =1049a(9) =1721a(10) =17105a(11) =18645a(12) =27761a(13) =61661a(14) =79773a(15) =403461a(16) =527037a(17) =722805