Numbers k such that 10*13^k + 1 is prime.

Terms

a(0) =0a(1) =1a(2) =4a(3) =7a(4) =8a(5) =26a(6) =33a(7) =64a(8) =116a(9) =201a(10) =1278a(11) =1927a(12) =2549a(13) =4054a(14) =5379a(15) =5704a(16) =6639a(17) =13785a(18) =18918a(19) =19085