Coding challenge

Imagine plotting every prime number $p$ in polar coordinates $(r, \theta)$, where the radius is $r = p$ and the angle is $\theta = p$ radians: $$x = (0.4 \times p) \cos(p), \quad y = (0.4 \times p) \sin(p)$$ (Here $0.4$ scales the spiral so it fits comfortably on the screen).

Write a primality testing function, and plot the polar coordinates for all primes up to $500$ using pset(x, y). Do you notice how the prime numbers align into sweeping spiral arms and rays?

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