Class 1+ primes: primes of the form 2^i*3^j - 1 with i, j >= 0.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =17a(6) =23a(7) =31a(8) =47a(9) =53a(10) =71a(11) =107a(12) =127a(13) =191a(14) =383a(15) =431a(16) =647a(17) =863a(18) =971a(19) =1151a(20) =2591a(21) =4373a(22) =6143a(23) =6911a(24) =8191a(25) =8747a(26) =13121a(27) =15551a(28) =23327a(29) =27647