Or what the Frobeniusnumber is for given box sizes (ie, the largest number of McNuggets that you cannot buy (exactly). For the classical sizes of {6,9,20} it's 43).
Re:McNugget Calculator
by lazycouchpotato on Monday May 20, 2019 @12:11AM
(#19957461)
Here's a Numberphile video on it. https://www.youtube.com/watch?v=vNTSugyS038
http://mathworld.wolfram.com/McNuggetNumber.html