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gcd grid explorer

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Matthew
Conroy
A tool for exploring the "gcd grid": a lattice of positive integer coordinates (i,j) which are "on" if gcd(i,j)=1, and "off" otherwise. I've been amused by this structure since it was on an edition of Kenneth Rosen's "Introduction to Number Theory" way back. Check out the earliest 2x2 at (14,20), the earliest 3x3 at (1274,1308) and the F-pattern at (90,24). Experience it all.
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