Numbers k such that 3*4^k+1 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =6a(4) =9a(5) =15a(6) =18a(7) =33a(8) =138a(9) =204a(10) =219a(11) =267a(12) =1104a(13) =1408a(14) =1584a(15) =1956a(16) =17175a(17) =21147a(18) =24075a(19) =27396a(20) =27591a(21) =40095a(22) =354984a(23) =400989a(24) =916248a(25) =1145805a(26) =2541153a(27) =5414673