%I #11 Jul 28 2021 04:25:20
%S 2,5,6,8,12,23,24,26,27,29,35,36,42,44,51,54,56,57,62,66,69,71,75,78,
%T 80,86,89,92,93,96,101,102,104,108,116,117,120,122,123,128,129,134,
%U 135,137,146,153,155,156,170,177,185,188,194,195,197,200,201,207,215
%N Numbers k such that k prefixed by '8' and followed by '3' is prime.
%t Select[Range[300],PrimeQ[FromDigits[Join[{8},IntegerDigits[#],{3}]]]&] (* _Harvey P. Dale_, Aug 20 2015 *)
%K nonn,base
%O 1,1
%A _Patrick De Geest_, May 15 1998