Numbers m such that m and 2*m + 7 both prime.

Terms

a(0) =2a(1) =3a(2) =5a(3) =11a(4) =17a(5) =23a(6) =41a(7) =47a(8) =53a(9) =71a(10) =83a(11) =113a(12) =131a(13) =137a(14) =173a(15) =191a(16) =197a(17) =227a(18) =251a(19) =257a(20) =281a(21) =293a(22) =317a(23) =347a(24) =383a(25) =401a(26) =461a(27) =467a(28) =503a(29) =521