Prime Number Spiral: SpirallingA repeated increase or decrease of the central number is obtained by clicking on or on .
When spiralling in, the central number increases (the numbers spiral in toward the center), and when spiralling out, the central number decreases.
The example at left (which shows about 50% by area of the graphical display) results from starting with central number = 41 (pixel size = 15; color by sequence color), and spiralling out (until central number = 17 is reached, when the animated GIF repeats).
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