[smacke]

Discussion on reddit from when I posted about this (more than 10 years ago now!): https://old.reddit.com/r/math/comments/144qc4/a_beautiful_pr...

Original pdf seems to have been taking down from AOPS but is still available in the internet archive: https://web.archive.org/web/20121018044426/https://artofprob...

[mehulashah]

Interesting, the proof seems to have originated as a submission to The Art of Problem Solving. I wish I had these site when I was in high school. I would have poured over them.

[milesde]

Close. I sent it to rrusczyk around the time it got accepted by the Monthly. I wanted him to see it because AoPS was playing a huge role in my mathematical education at the time, and was happy when he wanted to post it on the website.

[pixelpoet]

It's *pored over BTW