Numbers k such that (305*10^k + 1)/9 is prime.

Terms

a(0) =2a(1) =3a(2) =12a(3) =14a(4) =38a(5) =126a(6) =147a(7) =152a(8) =216a(9) =285a(10) =774a(11) =1458a(12) =2049a(13) =3369a(14) =5718a(15) =8358a(16) =12510a(17) =13863a(18) =30308a(19) =38732a(20) =128198