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

Terms

a(0) =5a(1) =7a(2) =9a(3) =17a(4) =19a(5) =51a(6) =53a(7) =81a(8) =83a(9) =119a(10) =189a(11) =219a(12) =227a(13) =301a(14) =455a(15) =461a(16) =623a(17) =2037a(18) =2221a(19) =2455a(20) =3547a(21) =5515a(22) =6825a(23) =8303a(24) =9029a(25) =12103a(26) =49989a(27) =55525a(28) =64773a(29) =80307