If you like imaginative/challenging math/logic/CS problems, take a gander at The Riddler, a weekly puzzle column FiveThirtyEight ran until 2023. Its editor now continues it as Fiddler on the Proof.

I solved several, with at least one of my solutions (archived) featured with a shout-out. My solution with code is on GitHub. This particular problem was a fun little geometry problem which I opted to solve via simulation and numerical geometry, though others found an elegant analytical solution.