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Digit Reversal Without Apology

by Lara Pudwell (Rutgers University)

This article originally appeared in:
Mathematics Magazine
April, 2007

Subject classification(s): Algebra and Number Theory | Number Theory
Applicable Course(s): 4.3 Number Theory

The number 1089 has the curious property that when one reverses its digits, an integer multiple of itself is obtained. The author gives a structure theorem for certain sets of reversible numbers.


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