Numbers k such that 2^k - 1 - Sum_{prime p<k} 2^p is prime.

Terms

a(0) =2a(1) =3a(2) =4a(3) =5a(4) =6a(5) =7a(6) =8a(7) =21a(8) =25a(9) =33a(10) =40a(11) =58a(12) =157a(13) =158a(14) =226a(15) =239a(16) =240a(17) =295a(18) =465a(19) =730a(20) =1774a(21) =2184a(22) =2351a(23) =2352a(24) =3279a(25) =4221a(26) =6340a(27) =6373a(28) =6374a(29) =17822