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

Terms

a(0) =3a(1) =9a(2) =13a(3) =15a(4) =25a(5) =49a(6) =55a(7) =69a(8) =115a(9) =2071a(10) =6249a(11) =13669a(12) =14215a(13) =14625a(14) =396127