accidentally creating ulam spiral

I accidentally created https://en.wikipedia.org/wiki/Ulam_spiral in Excel about a year and a half ago during my “numbers are the answer” period. I was SO EXCITED because these prime numbers were lining up along the diagonals! I was telling my smarter friends about my new discovery – they were excited… and then… I found this… some other guy 50 yrs ago did it already :-| but at least I was on the right track.

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