Given a multipler X and a modulus Y, space Y points evenly around a circle,
and connect point A to point B if B = A * X mod Y.
The connected groups of links are highlighted one by one, with arrows
showing the direction of the link. Interestingly, these groups don't form
loops (multiple points can link to a single destination point), and many of
them are surprisingly asymmetrical.
Both the multiplier and the modulus must be integers greater than 0, and the
multiplier must be less than the modulus.
Inspired by
this Mathologer video.