Primes that remain prime through 2 iterations of the function f(x) = 5x + 4.

Terms

a(0) =5a(1) =17a(2) =83a(3) =101a(4) =131a(5) =251a(6) =257a(7) =263a(8) =389a(9) =419a(10) =461a(11) =467a(12) =521a(13) =587a(14) =797a(15) =809a(16) =1217a(17) =1319a(18) =1511a(19) =1721a(20) =1847a(21) =1907a(22) =2141a(23) =2531a(24) =2579a(25) =2693a(26) =2699a(27) =3623a(28) =4079a(29) =4217