The book is now available! 15365639
(another Prime Pages' Curiosity)
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+ In 1769, Euler conjectured that the sum of three fourth powers is never a fourth power. However in 1988, Noam Elkies at Harvard discovered a counterexample: 2682440^4 + 15365639^4 + 18796760^4 = 20615673^4. [Beedassy]




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