Primes of the form 2^i * 3^j - 1 for positive i, j.

Terms

a(0) =5a(1) =11a(2) =17a(3) =23a(4) =47a(5) =53a(6) =71a(7) =107a(8) =191a(9) =383a(10) =431a(11) =647a(12) =863a(13) =971a(14) =1151a(15) =2591a(16) =4373a(17) =6143a(18) =6911a(19) =8747a(20) =13121a(21) =15551a(22) =23327a(23) =27647a(24) =62207a(25) =73727a(26) =139967a(27) =165887a(28) =294911a(29) =314927