Numbers k such that 77*2^k+1 is prime.

Terms

a(0) =3a(1) =7a(2) =19a(3) =23a(4) =95a(5) =287a(6) =483a(7) =559a(8) =655a(9) =667a(10) =1639a(11) =9399a(12) =39639a(13) =63883a(14) =71575a(15) =164319a(16) =401947a(17) =614995a(18) =2762047a(19) =5422903