Primes that remain prime through 2 iterations of the function f(x) = 2x + 7.

Terms

a(0) =2a(1) =5a(2) =17a(3) =23a(4) =53a(5) =83a(6) =137a(7) =197a(8) =227a(9) =257a(10) =293a(11) =317a(12) =347a(13) =383a(14) =467a(15) =593a(16) =647a(17) =677a(18) =683a(19) =797a(20) =857a(21) =953a(22) =1163a(23) =1193a(24) =1217a(25) =1607a(26) =1877a(27) =1907a(28) =1913a(29) =1997