Numbers k such that 2^k - 13 is prime.

Terms

a(0) =4a(1) =5a(2) =9a(3) =13a(4) =17a(5) =57a(6) =105a(7) =137a(8) =3217a(9) =3229a(10) =4233a(11) =6097a(12) =8757a(13) =11457a(14) =12073a(15) =15425a(16) =40117a(17) =45357a(18) =334809a(19) =1509037