103育成高中
Prove that the number \( \underbrace{111\ldots 11}_{1997}\underbrace{22\ldots 22}_{1998}5 \)(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
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2014-7-30 20:28, 下載次數: 15017
