Numbers k such that (77*10^k - 257)/9 is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =8a(4) =9a(5) =23a(6) =24a(7) =32a(8) =69a(9) =96a(10) =243a(11) =381a(12) =2237a(13) =2426a(14) =2427a(15) =4041a(16) =5195a(17) =5516a(18) =7053a(19) =9690a(20) =33933a(21) =66237a(22) =93249