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

Terms

a(0) =23a(1) =683a(2) =1663a(3) =2753a(4) =3203a(5) =6073a(6) =6323a(7) =7523a(8) =8243a(9) =9293a(10) =9613a(11) =15173a(12) =19913a(13) =21023a(14) =21683a(15) =25183a(16) =26633a(17) =29663a(18) =34613a(19) =34703a(20) =39293a(21) =41953a(22) =43283a(23) =45533a(24) =52813a(25) =59393a(26) =62473a(27) =65053a(28) =66763a(29) =71713