Integers k such that 10^k + 31 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =14a(4) =18a(5) =44a(6) =54a(7) =89a(8) =469a(9) =2060a(10) =2985a(11) =6197a(12) =16452a(13) =19393a(14) =21205a(15) =49657a(16) =74670a(17) =76374