https://en.wikipedia.org/wiki/Ulam_spiral
Why do prime numbers make these spirals? | Dirichlet’s theorem and pi approximations - 3Blue1Brown
https://www.youtube.com/watch?v=EK32jo7i5LQ
https://en.wikipedia.org/wiki/Ulam_spiral
Why do prime numbers make these spirals? | Dirichlet’s theorem and pi approximations - 3Blue1Brown
https://www.youtube.com/watch?v=EK32jo7i5LQ