A set having the largest number of distinct residue classes modulo so that no Subset has zero sum.

**References**

Guy, R. K. ``Maximal Zero-Sum-Free Sets.'' §C15 in
*Unsolved Problems in Number Theory, 2nd ed.* New York: Springer-Verlag, pp. 129-131, 1994.

© 1996-9

1999-05-26