Sierpinski, W.  <br/><br/>
250 Problems in elementary number theory (EBOOK) 
W. SIERPINSKI 
 - New York  AMERICAN ELSEVIER PUBLISHING COMPANY  1970 
 - 139 p. 
<br/><br/><label>ISBN: </label>444000712 
<br/><br/><label>Subjects--Topical Terms: </label><br/>elementary number theory
<br/><br/><label>Dewey Class. No.: </label>512.72