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Saturday, July 23, 2011

a,b,c fraction integer

Given positive integers a,b,c such that
\frac{a}{b} + \frac{b}{c} + \frac{c}{a}
is also an integer, show that
\frac{a^2b^2}{c},\frac{b^2c^2}{a}, \frac{c^2a^2}{b}
are all cubic numbers.

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