Primes that remain prime through 4 iterations of function f(x) = 8x + 7.

Terms

a(0) =7949a(1) =25589a(2) =55799a(3) =61379a(4) =69959a(5) =70229a(6) =74609a(7) =174569a(8) =188369a(9) =204719a(10) =220469a(11) =225629a(12) =233759a(13) =250919a(14) =286619a(15) =363659a(16) =552749a(17) =592139a(18) =658349a(19) =735419a(20) =783269a(21) =827549a(22) =931949a(23) =1018889a(24) =1065839a(25) =1126319a(26) =1132739a(27) =1187939a(28) =1215629a(29) =1378529