Numbers k such that (11*13^k -1)/2 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =9a(5) =11a(6) =21a(7) =42a(8) =46a(9) =61a(10) =69a(11) =70a(12) =78a(13) =99a(14) =183a(15) =361a(16) =1034a(17) =1291a(18) =1570a(19) =1838a(20) =5994a(21) =33138