Guy, Richard K. <br/><br/>
Unsolved problems in number theory/ 
Richard K. Guy. 
 - New York:  Springer-Verlag,  c1981. 
 - xviii, 161 p.:  ill.;  24 cm. 
 - Unsolved problems in intuitive mathematics;  v. 1 Problem books in mathematics. .
 - Guy, Richard K.  v. 1. .
 - Unsolved problems in intuitive mathematics;  v. 1 .
<br/><br/>Includes bibliographies and indexes. 
<br/><br/><label>ISBN: </label>0387905936 
<br/><br/><label>LCCN: </label>81014551 //r92 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory---Problems, exercises, etc.
<br/><br/><label>Dewey Class. No.: </label>512.7  / G986u