Numbers k such that (13*10^k + 401)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =6a(4) =7a(5) =15a(6) =18a(7) =57a(8) =75a(9) =82a(10) =358a(11) =1347a(12) =2278a(13) =2577a(14) =4156a(15) =6712a(16) =7471a(17) =14437a(18) =15247a(19) =28251a(20) =62914a(21) =78213a(22) =158694