Can’t find the file but anyway, I had accidentally created https://en.wikipedia.org/wiki/Ulam_spiral – in Excel and was blown away at the patterns. I just typed in 1, then 2 next to it, then I went up and typed 3 then left and type 5, and so on and so on.
I was so excited for a few minutes. Then I looked it up “number spirals” and such ’til I came across the same pattern.
Oh well.. at least my brain was in good company.