Numbers m such that m and 2*m + 5 are both prime.

Terms

a(0) =3a(1) =7a(2) =13a(3) =19a(4) =31a(5) =37a(6) =61a(7) =67a(8) =73a(9) =79a(10) =97a(11) =103a(12) =109a(13) =139a(14) =151a(15) =163a(16) =181a(17) =229a(18) =241a(19) =271a(20) =283a(21) =307a(22) =313a(23) =367a(24) =373a(25) =409a(26) =439a(27) =457a(28) =523a(29) =541