Prime Curios!: 487

487
(another Prime Pages' Curiosity)

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Fermat claimed (correctly) that a number is the sum of three squares unless it is of the form 4ⁿ(8m + 7), with n,m greater than or equal to 0.

Submitted: 2006-08-26 11:36:55; Last Modified: 2008-07-31 12:52:54.