Numbers k such that 13*10^k + 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =16a(5) =53a(6) =95a(7) =105a(8) =125a(9) =163a(10) =358a(11) =423a(12) =562a(13) =1774a(14) =3459a(15) =13957a(16) =17962a(17) =51179a(18) =65963a(19) =72808