Numbers k such that 8^k - 9 is prime.

Terms

a(0) =3a(1) =7a(2) =11a(3) =47a(4) =81a(5) =95a(6) =107a(7) =179a(8) =233a(9) =243a(10) =947a(11) =2817a(12) =2859a(13) =3233a(14) =7563a(15) =11307a(16) =218615a(17) =225587a(18) =1160027