On the equation $a^p + 2^α b^p + c^p = 0$

Tom 79 / 1997

Kenneth Ribet Acta Arithmetica 79 (1997), 7-16 DOI: 10.4064/aa-79-1-7-16


We discuss the equation $a^p + 2^α b^p + c^p = 0$ in which a, b, and c are non-zero relatively prime integers, p is an odd prime number, and α is a positive integer. The technique used to prove Fermat's Last Theorem shows that the equation has no solutions with α < 1 or b even. When α=1 and b is odd, there are the two trivial solutions (±1, ∓ 1, ±1). In 1952, Dénes conjectured that these are the only ones. Using methods of Darmon, we prove this conjecture for p≡ 1 mod 4.


  • Kenneth Ribet

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