Primes that remain prime through 3 iterations of function f(x) = 6x + 1.

Terms

a(0) =61a(1) =101a(2) =1811a(3) =3491a(4) =4091a(5) =5711a(6) =5801a(7) =6361a(8) =7121a(9) =10391a(10) =10771a(11) =11311a(12) =13421a(13) =15131a(14) =17791a(15) =18911a(16) =19471a(17) =20011a(18) =24391a(19) =25601a(20) =25951a(21) =30091a(22) =35251a(23) =41911a(24) =45631a(25) =47431a(26) =55631a(27) =58711a(28) =62921a(29) =67891