Numbers k such that k prefixed by '8' and followed by '1' is prime.

Terms

a(0) =1a(1) =2a(2) =8a(3) =10a(4) =11a(5) =16a(6) =17a(7) =19a(8) =22a(9) =23a(10) =29a(11) =31a(12) =43a(13) =46a(14) =50a(15) =52a(16) =58a(17) =64a(18) =68a(19) =73a(20) =74a(21) =76a(22) =82a(23) =83a(24) =86a(25) =94a(26) =95a(27) =97a(28) =100a(29) =103