Numbers k such that (316*10^k - 1)/9 is prime.

Terms

a(0) =2a(1) =3a(2) =8a(3) =9a(4) =11a(5) =14a(6) =17a(7) =23a(8) =29a(9) =38a(10) =50a(11) =129a(12) =164a(13) =578a(14) =1592a(15) =2951a(16) =4505a(17) =16826a(18) =17438a(19) =22748