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Chinese remainder to the rescue (Posted on 2020-10-31) Difficulty: 3 of 5
A lattice point in the coordinate plane with origin O is called invisible if the segment OA contains a lattice point other than O and A. Let L be a positive integer. Show that there exists a square with side length L and sides parallel to the coordinate axes, such that all points in the square are invisible.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
some progressSteven Lord2020-11-02 05:11:00
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