MathDB
N 17

Source:

May 25, 2007
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Problem Statement

Suppose that aa and bb are distinct real numbers such that ab,  a2b2,  ,  akbk,  a-b, \; a^{2}-b^{2}, \; \cdots, \; a^{k}-b^{k}, \; \cdots are all integers. Show that aa and bb are integers.