Numbers k such that (13*10^k + 311)/9 is prime.

Terms

a(0) =2a(1) =4a(2) =5a(3) =14a(4) =28a(5) =34a(6) =209a(7) =398a(8) =482a(9) =904a(10) =1036a(11) =1748a(12) =2128a(13) =5998a(14) =7786a(15) =10402a(16) =18347a(17) =20806a(18) =33100