Primes p such that 4*p + 7 is also prime.

Terms

a(0) =3a(1) =13a(2) =19a(3) =31a(4) =43a(5) =61a(6) =103a(7) =109a(8) =139a(9) =163a(10) =241a(11) =271a(12) =313a(13) =373a(14) =379a(15) =499a(16) =523a(17) =601a(18) =613a(19) =631a(20) =643a(21) =673a(22) =709a(23) =733a(24) =739a(25) =751a(26) =769a(27) =811a(28) =823a(29) =829