Numbers k such that 27*2^k+1 is prime.

Terms

a(0) =2a(1) =4a(2) =7a(3) =16a(4) =19a(5) =20a(6) =22a(7) =26a(8) =40a(9) =44a(10) =46a(11) =47a(12) =50a(13) =56a(14) =59a(15) =64a(16) =92a(17) =175a(18) =215a(19) =275a(20) =407a(21) =455a(22) =1076a(23) =1090a(24) =3080a(25) =3322a(26) =6419a(27) =7639a(28) =19360a(29) =30500