Wow I had no idea. Thanks! Macroexpanded:

Unscrambling the hidden secrets of superpermutations - https://news.ycombinator.com/item?id=39325146 - Feb 2024 (8 comments)

Mystery math whiz and novelist advance permutation problem - https://news.ycombinator.com/item?id=36191831 - June 2023 (92 comments)

An Anonymous 4chan Post Helped Solve a 25-Year-Old Math Puzzle (2018) - https://news.ycombinator.com/item?id=23968618 - July 2020 (7 comments)

Nobody knows how to cite 4chan mathematicians who solved an interesting problem - https://news.ycombinator.com/item?id=18292061 - Oct 2018 (198 comments)

If anyone can find other threads in this set, let me know and I'll add them here.