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Prime Spiral

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Gerd
Platl
Draw fermat's spiral with colorized points. White: Numbetr is a Prime number. Red: Number can be divided by 2 Green: Number can be divided by 5
mouse: press left mouse button to change angle press right mouse button to zoom in/out keys: r reset parameters s save picture file as 'PrimeSpiral.png' +/- change point size
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