Numbers k such that k concatenated with k+5 is a prime.

Terms

a(0) =12a(1) =16a(2) =18a(3) =28a(4) =46a(5) =64a(6) =76a(7) =78a(8) =82a(9) =88a(10) =102a(11) =126a(12) =132a(13) =138a(14) =148a(15) =154a(16) =178a(17) =184a(18) =186a(19) =196a(20) =208a(21) =214a(22) =226a(23) =228a(24) =234a(25) =246a(26) =264a(27) =282a(28) =288a(29) =298