Primes that remain prime through 3 iterations of function f(x) = 2x + 3.

Terms

a(0) =2a(1) =5a(2) =47a(3) =67a(4) =97a(5) =137a(6) =197a(7) =277a(8) =307a(9) =607a(10) =617a(11) =1307a(12) =1427a(13) =2857a(14) =5717a(15) =6047a(16) =6217a(17) =6257a(18) =6997a(19) =9377a(20) =9787a(21) =9967a(22) =11197a(23) =12097a(24) =13297a(25) =13997a(26) =14347a(27) =16057a(28) =18757a(29) =18947