There are two Lex Luthors running around
http://www.comicvine.com/lex-luthor/41678/ (223 issues)
http://www.comicvine.com/lex-luthor/41952/ (49 issues)
But there are some problems. The Lex Luthor with 49 issues has more information (cut and paste?).
The other problem is that if I search under "Lex" or "Luthor," I only get the 49 issues Lex and not the 223 issues Lex. I even tried searching under "Lexluthor" and got nothing. I only found out about the 223 issue Lex Luthor from the Browse page. Is there something wrong with his name that I can't see?