Numbers k such that 4*10^k - 9 is prime.

Terms

a(0) =1a(1) =17a(2) =19a(3) =29a(4) =43a(5) =119a(6) =173a(7) =949a(8) =1609a(9) =5579a(10) =19679a(11) =34147a(12) =43493a(13) =97799