Primes that remain prime through 4 iterations of function f(x) = 2x + 7.

Terms

a(0) =293a(1) =2063a(2) =4583a(3) =9203a(4) =14723a(5) =20123a(6) =25733a(7) =29453a(8) =40253a(9) =54713a(10) =76103a(11) =97523a(12) =99833a(13) =109433a(14) =138683a(15) =149993a(16) =158243a(17) =196853a(18) =199403a(19) =218873a(20) =253103a(21) =297623a(22) =379913a(23) =416963a(24) =445463a(25) =468113a(26) =508073a(27) =551963a(28) =562403a(29) =564713