Numbers k such that (68*10^k + 1)/3 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =8a(4) =9a(5) =14a(6) =15a(7) =20a(8) =32a(9) =37a(10) =123a(11) =134a(12) =135a(13) =288a(14) =361a(15) =414a(16) =469a(17) =510a(18) =6272a(19) =11204a(20) =11694a(21) =16788a(22) =20718