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(3/5) Determine all ordered pairs <math>(x,y)</math> of nonnegative integers such that <cmath>\sum_{i=1}^{x}i! = 3^y</cmath>

Revision as of 18:20, 13 April 2009

(3/5) Determine all ordered pairs $(x,y)$ of nonnegative integers such that \[\sum_{i=1}^{x}i! = 3^y\]

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