00313nam a2200121Ia 4500008004100000040001700041041001200058082001600070100001600086245004200102250001200144260003500156230917s9999||||xx |||||||||||||| ||und||  e226743aMAIN  aEnglish  a512.7 N644I  aNiven, Ivan 0aIntroduction to the theory of numbers  a3rd ed.  aNew DelhibWiley Easternc1989