Next-to-smallest k such that 2^(2^n) - k is prime.

Terms

a(0) =2a(1) =5a(2) =15a(3) =17a(4) =17a(5) =83a(6) =173a(7) =357a(8) =629a(9) =179a(10) =2543a(11) =8067a(12) =5619a(13) =29027a(14) =38783a(15) =99267