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A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

1
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According to http://mathworld.wolfram.com/BusyBeaver.html, "some authors define a busy beaver as a Turing machine that performs a maximum number S(n) of steps when started on an initially blank tape b …
answered Apr 25 '19 by Gnubie
3
votes
Here's a solution that doesn't need the 10 L jug to measure: STEP |CONTENT OF | 3L | 7L ------------- …
answered Apr 6 '20 by Gnubie
1
vote
My proposal was to sum the digits and take the units place (9 + 7 = 16 so take 6) and append it to two copies of the table number (97976). When the code is received (say, 97971), if the first two pai …
answered Sep 20 '16 by Gnubie
-4
votes
3answers
At a pub, a friend spotted our table number being 412; there were nowhere near 400 tables. We mused if it could include a checksum so the bartender could tell if customers gave an invalid number. I …
asked Sep 15 '16 by Gnubie