Problem 2648. Ulam spiral 2: The revenge
Starting from the problem https://www.mathworks.com/matlabcentral/cody/problems/2644-the-ulam-matrix, transform the Ulam Matrix into coordinates to plot the spiral.

So:
- point 1 will have coordinates (0,0)
- point 2 will have coordinates (1,0)
- point 3 will have coordinates (1,1)
- point 4 will have coordinates (0,1)
and so on...
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