I accidentally created
  [1]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.

References

  Visible links
  1. https://en.wikipedia.org/wiki/Ulam_spiral

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