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IMO Shortlist 2006 problem N5

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Dodao/la: arhiva
April 2, 2012

2006 diofantska shortlist tb

Prove that the equation doesn't have integer solutions!

%V0 Prove that the equation $\frac {x^{7} - 1}{x - 1} = y^{5} - 1$ doesn't have integer solutions!