To be fair, it is pretty hard to find out what number is its own subfactorial. Wolfram Alpha can't figure it out, at least not with standard computation time. Also, when I asked the question in Google to see if anyone had an answer, I found nothing, but the AI gave an answer that ended with the bullet point "For 2, the subfactorial of 2 (!2) is 1, which is equal to 2 itself." AI has a long way to go...
Statistics: Posted by CorrectHorseBattery — 16 Nov 2024 23:32