Numbers k such that (13*10^k + 347)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =9a(4) =12a(5) =18a(6) =24a(7) =31a(8) =36a(9) =39a(10) =57a(11) =91a(12) =129a(13) =529a(14) =798a(15) =1279a(16) =1728a(17) =6603a(18) =12883a(19) =29463a(20) =77811