Primes that remain prime through 2 iterations of the function f(x) = 2x + 9.

Terms

a(0) =5a(1) =11a(2) =19a(3) =31a(4) =59a(5) =61a(6) =71a(7) =101a(8) =109a(9) =151a(10) =179a(11) =239a(12) =241a(13) =269a(14) =281a(15) =389a(16) =409a(17) =439a(18) =449a(19) =521a(20) =571a(21) =641a(22) =659a(23) =719a(24) =829a(25) =911a(26) =971a(27) =1051a(28) =1061a(29) =1181