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Sum-Difference Numbers

by Yixun Shi (Bloomsburg University)

This article originally appeared in:
College Mathematics Journal
November, 2010

Subject classification(s): Numbers and Computation | Number Concepts | Natural Numbers
Applicable Course(s): 1.3 High School Elementary Algebra | 4.10 Math for High School Teachers

The author characterizes the positive integers that are the products of two pairs of factors such that the sum of one pair equals the difference of the other.

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