Numbers k such that (7*3^k + 5)/2 is prime.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =21a(5) =27a(6) =65a(7) =191a(8) =327a(9) =371a(10) =575a(11) =1895a(12) =2375a(13) =2607a(14) =9735a(15) =48951