00321nam a2200121Ia 4500008004100000020001800041040002500059082001600084100001800100245002900118260004200147300001000189240301s9999    xx            000 0 und d  a9789719645412  aNORSU-BaycNORSU-Bay  a512.72  D62  aDio, Ryan V.  0aNumber Theory: A Primer   aManila, PHbGreat Books Tradingc2017  a122 p