Numbers k such that 13^k - 2 is a prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =12a(5) =78a(6) =80a(7) =90a(8) =117a(9) =120a(10) =813a(11) =1502a(12) =2306a(13) =2946a(14) =6308a(15) =13320a(16) =26369a(17) =31868a(18) =44265a(19) =81008