Primes that remain prime through 4 iterations of function f(x) = 8x + 3.

Terms

a(0) =13121a(1) =117281a(2) =188831a(3) =317971a(4) =429281a(5) =624721a(6) =627791a(7) =722431a(8) =774791a(9) =883721a(10) =924731a(11) =946291a(12) =1002721a(13) =1083851a(14) =1212011a(15) =1221601a(16) =1249111a(17) =1342361a(18) =1469761a(19) =1665761a(20) =1896901a(21) =2003081a(22) =2156251a(23) =2336011a(24) =2382761a(25) =2391451a(26) =2612021a(27) =2634551