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

Terms

a(0) =2a(1) =4a(2) =6a(3) =8a(4) =38a(5) =66a(6) =72a(7) =126a(8) =140a(9) =152a(10) =174a(11) =332a(12) =710a(13) =820a(14) =2528a(15) =2582a(16) =2668a(17) =2776a(18) =2982a(19) =3826a(20) =6144a(21) =15778a(22) =23518a(23) =75504