Numbers k such that (209*10^k - 17)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =13a(5) =14a(6) =37a(7) =38a(8) =54a(9) =60a(10) =69a(11) =668a(12) =693a(13) =825a(14) =1275a(15) =1566a(16) =3129a(17) =5745a(18) =6439a(19) =21991a(20) =24992a(21) =61947a(22) =96722