Prime Number Patterns

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Move your pointer across the graphic. The prime numbers are those that are only intersected by two curves; a composite number yields curves with semicircles whose diameters are the divisors of the number.
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Contributed by: Enrique Zeleny (January 2013)
Open content licensed under CC BY-NC-SA
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This Demonstration is based on Prime Number Patterns by Jason Davies.
Permanent Citation
"Prime Number Patterns"
http://demonstrations.wolfram.com/PrimeNumberPatterns/
Wolfram Demonstrations Project
Published: January 22 2013