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

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =6a(5) =16a(6) =18a(7) =54a(8) =58a(9) =100a(10) =120a(11) =504a(12) =1302a(13) =3234a(14) =14748a(15) =16102a(16) =22782a(17) =34656a(18) =64764a(19) =70866a(20) =194940a(21) =274074a(22) =313344a(23) =331416a(24) =354640