Guy, Richard K. <br/><br/>
Unsolved problems in number theory / 
Richard Guy. 
 - [3rd ed.]. 
 - New York :  Springer,  c2004. 
 - xviii, 437 p. : 
 - Problem books in mathematics .
<br/><br/><label>ISBN: </label>9781441919281 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory.
<br/><br/><label>Dewey Class. No.: </label>512.7  / GUY/U