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

Terms

a(0) =1a(1) =2a(2) =3a(3) =17a(4) =25a(5) =81a(6) =140a(7) =142a(8) =152a(9) =280a(10) =291a(11) =406a(12) =4209a(13) =4785a(14) =8474a(15) =9550a(16) =9596a(17) =21773a(18) =22352a(19) =24938a(20) =38428a(21) =48526a(22) =65426a(23) =75441a(24) =76705