Primes that remain prime through 3 iterations of function f(x) = 8x + 3.

Terms

a(0) =31a(1) =191a(2) =821a(3) =3271a(4) =11171a(5) =13121a(6) =14591a(7) =21521a(8) =27751a(9) =30341a(10) =35951a(11) =37561a(12) =39671a(13) =40231a(14) =43651a(15) =51061a(16) =51551a(17) =56671a(18) =68161a(19) =73681a(20) =84871a(21) =91541a(22) =92581a(23) =102031a(24) =102871a(25) =102881a(26) =104971a(27) =117281a(28) =127781a(29) =128201