Numbers k such that (12^k - 1)/11 is prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =19a(4) =97a(5) =109a(6) =317a(7) =353a(8) =701a(9) =9739a(10) =14951a(11) =37573a(12) =46889a(13) =769543