Also posted at:
- wiki.bbchallenge.org/w/index.php?title=Antihydra&oldid=958 But obviously it got deleted, not even a tiny shitpage maintained by 5 people is immune to it.
- cstheory.stackexchange.com/questions/20978/what-is-the-smallest-turing-machine-where-it-is-unknown-if-it-halts-or-not/53326#53326
- cs.stackexchange.com/questions/59344/what-are-very-short-programs-with-unknown-halting-status/162108#162108