Fermat Set cannot be Extended to Diophantine Quintuple
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Theorem
The Fermat set $F = \set {1, 3, 8, 120}$ cannot be extended to a Diophantine quintuple.
Proof
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Sources
- 1969: A. Baker and H. Davenport: The equations $3x^2 − 2 = y^2$ and $8 x^2 − 7 = z^2$ (Quart. J. Math. Vol. 20: pp. 129 – 137)
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $120$