"There’s an anime called The Melancholy of Haruhi Suzumiya that’s about time travel and, appropriately, you can watch the episodes in any order. In 2011, someone posted on 4Chan asking: “If viewers wanted to see the series in every possible order, what is the shortest list of episodes they’d have to watch?” An anonymous commenter replied with a #proof demonstrating a lower bound. Mathematicians eventually realized that the proof was a breakthrough in a tricky permutation problem and published a paper verifying it. The first author of that paper is “Anonymous 4Chan Poster”."
https://www.experimental-history.com/p/revenge-of-the-blockheads