Numbers k such that k concatenated with k+8 is a prime.

Terms

a(0) =1a(1) =3a(2) =13a(3) =15a(4) =21a(5) =39a(6) =49a(7) =55a(8) =69a(9) =75a(10) =91a(11) =111a(12) =115a(13) =159a(14) =163a(15) =165a(16) =169a(17) =171a(18) =183a(19) =193a(20) =195a(21) =199a(22) =201a(23) =205a(24) =211a(25) =229a(26) =235a(27) =241a(28) =249a(29) =265