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

Terms

a(0) =13a(1) =541a(2) =1087a(3) =1861a(4) =3727a(5) =23293a(6) =40387a(7) =87643a(8) =98899a(9) =109111a(10) =115153a(11) =116329a(12) =119101a(13) =131617a(14) =133597a(15) =163909a(16) =197521a(17) =214021a(18) =215389a(19) =218227a(20) =238207a(21) =263239a(22) =294751a(23) =489901a(24) =493693a(25) =665527a(26) =734131a(27) =767881a(28) =808693a(29) =895351