Primes that remain prime through 2 iterations of function f(x) = 6x + 1.

Terms

a(0) =2a(1) =17a(2) =47a(3) =61a(4) =101a(5) =131a(6) =151a(7) =331a(8) =367a(9) =461a(10) =607a(11) =751a(12) =937a(13) =971a(14) =1151a(15) =1321a(16) =1327a(17) =1361a(18) =1481a(19) =1511a(20) =1607a(21) =1811a(22) =1847a(23) =1907a(24) =2081a(25) =2287a(26) =2347a(27) =2357a(28) =2791a(29) =2851