Primes that remain prime through 3 iterations of function f(x) = 4x + 9.

Terms

a(0) =71a(1) =97a(2) =103a(3) =263a(4) =883a(5) =907a(6) =1747a(7) =1867a(8) =2251a(9) =2281a(10) =2693a(11) =2791a(12) =2857a(13) =3067a(14) =3541a(15) =4073a(16) =4513a(17) =4597a(18) =4663a(19) =4793a(20) =6047a(21) =6971a(22) =6983a(23) =8761a(24) =9091a(25) =9203a(26) =9311a(27) =9377a(28) =10343a(29) =11131