Plotting Prime Numbers (2021)

<i>Ulam Spiral</i> (and see ref to Martin Gardner&#x27;s famous SciAm article):<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ulam_spiral" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ulam_spiral</a><p><i>Why do prime numbers make these spirals? | Dirichlet’s theorem and pi approximations</i> - 3Blue1Brown<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=EK32jo7i5LQ" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=EK32jo7i5LQ</a>

you can not only map prime numbers in a circle&#x2F;spiral, but also in a triangle and get some nice knitting patterns :)<p><a href="https:&#x2F;&#x2F;tessi.github.io&#x2F;walking-the-ulam-spiral&#x2F;" rel="nofollow">https:&#x2F;&#x2F;tessi.github.io&#x2F;walking-the-ulam-spiral&#x2F;</a>

If you&#x27;re plotting primes, all the coordinates where you&#x27;re not plotting are non-prime - so every 2nd coordinate will be blank. As will every 3rd and every 4th, 5th, 10th, 11th. etc etc.<p>Surely that&#x27;s where the pattern comes from.