Visualizing Prime Numbers

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From Jason Davies, we have El Patron de Los Primos, probably one of the coolest prime number visualizer that I've seen.  For every Natural number, he draws a periodic curve that intersects at that number and each of its multiples.  Needless to say, prime numbers are touched by only two curves (itself and 1).
You can scroll to the right, and move up the prime food change.
(The image above is a screen grab.  Go here to see the actual thing)

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