Numbers k such that P = 2^k - 1 - Sum_{primes p<k} 2^(p-1) is prime.

Terms

a(0) =2a(1) =3a(2) =6a(3) =10a(4) =14a(5) =31a(6) =38a(7) =40a(8) =92a(9) =94a(10) =224a(11) =265a(12) =305a(13) =347a(14) =375a(15) =442a(16) =542a(17) =1326a(18) =2131a(19) =2749a(20) =3837a(21) =5461a(22) =10194a(23) =23128a(24) =24414a(25) =24960a(26) =25536a(27) =38828a(28) =48819