Numbers k such that 2^(k-1) - k is prime.

Terms

a(0) =5a(1) =11a(2) =15a(3) =17a(4) =27a(5) =51a(6) =57a(7) =71a(8) =117a(9) =2073a(10) =6251a(11) =13671a(12) =14217a(13) =14627a(14) =396128