Numbers k such that 8^k + 7 is prime.

Terms

a(0) =2a(1) =6a(2) =10a(3) =26a(4) =42a(5) =58a(6) =68a(7) =196a(8) =266a(9) =602a(10) =1170a(11) =1288a(12) =1290a(13) =2990a(14) =4110a(15) =6292a(16) =7446a(17) =36928a(18) =57490a(19) =65478a(20) =78570a(21) =188832a(22) =273452