Ulam Spiral (and see ref to Martin Gardner's famous SciAm article):
https://en.wikipedia.org/wiki/Ulam_spiral
Why do prime numbers make these spirals? | Dirichlet’s theorem and pi approximations - 3Blue1Brown
https://en.wikipedia.org/wiki/Ulam_spiral
Why do prime numbers make these spirals? | Dirichlet’s theorem and pi approximations - 3Blue1Brown
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