Relative Primes and GCDs

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The graphic plots a blue rectangle when the GCD of the coordinate is equal to the GCD setting, and a yellow rectangle otherwise. When the GCD is set to 1, blue represents all of the pairs that are relatively prime.
Contributed by: Marty Feuerstein-Mendik (August 2012)
(Mathematica Summer Camp 2012)
Open content licensed under CC BY-NC-SA
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"Relative Primes and GCDs"
http://demonstrations.wolfram.com/RelativePrimesAndGCDs/
Wolfram Demonstrations Project
Published: August 27 2012