Primes that remain prime through 4 iterations of function f(x) = 8x + 1.

Terms

a(0) =2207a(1) =126107a(2) =230567a(3) =366347a(4) =590207a(5) =788027a(6) =831167a(7) =919067a(8) =985937a(9) =1111427a(10) =1154567a(11) =1170857a(12) =1367507a(13) =1463597a(14) =1624757a(15) =1934417a(16) =2034797a(17) =2468027a(18) =2502767a(19) =2545307a(20) =3019787a(21) =3287027a(22) =3385817a(23) =3675197a(24) =3692207a(25) =4087757a(26) =4565927a(27) =4600577