Numbers k such that (68*10^k - 419)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =11a(5) =13a(6) =19a(7) =23a(8) =32a(9) =55a(10) =59a(11) =173a(12) =199a(13) =386a(14) =425a(15) =494a(16) =758a(17) =2473a(18) =4154a(19) =15355a(20) =47399a(21) =122933