Michael A. Bennett, Department of Mathematics, University of British Columbia, Vancouver, BC V6T 1Z2; email: bennett@math.ubc.ca

Jamie Mulholland, Department of Mathematics, University of British Columbia, Vancouver, BC V6T 1Z2; email: jmulholl@math.ubc.ca

We show, if \(p\) is prime, that the equation \(x^n+y^n=2pz^2\) has no solutions in coprime integers \(x\), \(y\) and \(z\) with \(|xy|>1\) and prime \(n>p^{27p^2}\), and, if \(p\ne7\), the equation \(x^n+y^n=pz^2\) has no solutions in coprime integers \(x\), \(y\) and \(z\) with \(|xy|>1\), \(z\) even and prime \(n>p^{3p^2}\).

Nous montrons que, si \(p\) est premier, l’équation \(x^n+y^n=2pz^2\) n’a pas de solution parmi les nombres entiers copremiers \(x\), \(y\), \(z\), avec \(|xy| > 1\) et \(n>p^{27p^2}\) premier. Nous montrons aussi que, si \(p\ne7\), l’équation \(x^n+y^n=pz^2\) n’a pas de solution parmi les nombres entiers copremiers \(x\), \(y\), \(z\), avec \(|xy| >1\), \(z\) pair, et \(n>p^{3p^2}\) premier.