Primes that remain prime through 5 iterations of function f(x) = 2x + 9.

Terms

a(0) =11a(1) =4931a(2) =21991a(3) =23021a(4) =37691a(5) =44531a(6) =46021a(7) =57601a(8) =62081a(9) =95621a(10) =124171a(11) =135731a(12) =142111a(13) =189271a(14) =191251a(15) =195511a(16) =216571a(17) =222841a(18) =238291a(19) =251611a(20) =269431a(21) =319211a(22) =368021a(23) =391031a(24) =413411a(25) =427711a(26) =468581a(27) =476591a(28) =625831a(29) =638431