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A Partition of 
 which can generate any number 1, 2, ..., 
.
See also Partition
References
Cohen, D. I. A.  Basic Techniques of Combinatorial Theory.  New York: Wiley and Sons, p. 97, 1978.
 
Honsberger, R. Mathematical Gems III.  Washington, DC: Math. Assoc. Amer., pp. 140-143, 1985.