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103育成高中

103育成高中

Prove that the number 111111997222219985(which has 1997 of 1-s and 1998 of 2-s) is a perfect square.
http://www.artofproblemsolving.c ... p?f=151&t=58633 
https://math.pro/db/thread-586-1-3.html

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103育成高中.zip (24.25 KB)

2014-7-30 20:28, 下載次數: 16484

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