%I
%S 0,2,6,9,11,15,23,27,30,32,33,39,41,44,48,50,56,57,62,65,68,69,74,78,
%T 81,84,90,92,95,104,113,119,120,126,128,134,138,141,147,150,156,159,
%U 161,167,168,171,180,185,189,191,197,210,215,216,218,222,225,231
%N Numbers k such that k prefixed by '5' and followed by '3' is prime.
%t Select[Range[0,250],PrimeQ[FromDigits[Join[{5},IntegerDigits[#],{3}]]]&] (* _Harvey P. Dale_, Mar 28 2013 *)
%K nonn,base
%O 1,2
%A _Patrick De Geest_, May 15 1998
