"In the work of Ramanujan, the number 24 appears repeatedly.
This is an example of what mathematicians call magic numbers,
which continually appear, where we least expect them,
for reasons that no one understands."
— Michio Kaku, Hyperspace, Oxford U. Press, 1994, p. 173
See also "A Reappearing Number," this journal, July 4, 2010.