Primes that remain prime through 5 iterations of the function f(x) = 9x + 4.

Terms

a(0) =421a(1) =773a(2) =1567a(3) =4111a(4) =68447a(5) =75721a(6) =111373a(7) =127301a(8) =137927a(9) =140321a(10) =156593a(11) =170767a(12) =177131a(13) =192341a(14) =194687a(15) =202637a(16) =240641a(17) =254407a(18) =254963a(19) =308303a(20) =321821a(21) =332951a(22) =395431a(23) =464131a(24) =515663a(25) =710081a(26) =822893a(27) =856393a(28) =989533a(29) =997123