Primes that remain prime through 2 iterations of function f(x) = 7x + 6.

Terms

a(0) =5a(1) =11a(2) =31a(3) =59a(4) =61a(5) =71a(6) =149a(7) =179a(8) =269a(9) =439a(10) =499a(11) =541a(12) =571a(13) =719a(14) =761a(15) =1049a(16) =1091a(17) =1181a(18) =1319a(19) =1451a(20) =1489a(21) =1579a(22) =1601a(23) =1831a(24) =1861a(25) =1879a(26) =1949a(27) =2069a(28) =2089a(29) =2269