Numbers k such that k prefixed by '8' and followed by '7' is prime.

Terms

a(0) =2a(1) =5a(2) =7a(3) =8a(4) =11a(5) =14a(6) =16a(7) =23a(8) =28a(9) =29a(10) =31a(11) =37a(12) =38a(13) =44a(14) =46a(15) =52a(16) =53a(17) =59a(18) =62a(19) =64a(20) =67a(21) =70a(22) =73a(23) =74a(24) =80a(25) =83a(26) =86a(27) =88a(28) =101a(29) =104