Primes that remain prime through 3 iterations of function f(x) = 6x + 7.

Terms

a(0) =5a(1) =37a(2) =127a(3) =347a(4) =977a(5) =2017a(6) =3607a(7) =5477a(8) =9137a(9) =10487a(10) =13687a(11) =14057a(12) =14107a(13) =19037a(14) =19697a(15) =19727a(16) =20507a(17) =22157a(18) =23887a(19) =24097a(20) =25237a(21) =25307a(22) =26717a(23) =26777a(24) =27107a(25) =29347a(26) =30697a(27) =33757a(28) =33997a(29) =34667