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

Terms

a(0) =2a(1) =3a(2) =9a(3) =13a(4) =19a(5) =21a(6) =55a(7) =261a(8) =3415a(9) =4185a(10) =7353a(11) =12213a(12) =44169a(13) =60975a(14) =61011a(15) =108049a(16) =182451a(17) =228271a(18) =481801a(19) =500899a(20) =505431a(21) =1015321a(22) =1061095a(23) =1397089