00380    a2200157   4500020001500000082001600015100002100031245002900052250000900081260003600090300002100126650001200147650001600159650001800175650002900193  a0072325690  a512.72bBUR  aBurton, David M.  aElementary number theory  a5th.  aBostonbMcGraw Hillc2002g2002  axv, 411p.c23cm.  aALGEBRA  aMATHEMATICS  aNUMBER THEORY  aELEMENTARY NUMBER THEORY