Find the smallest number that can be expressed as the sum of two (nonzero) perfect squares in two different ways.
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And what if the two perfect squares must be nonzero, positive, and different?

(In reply to A hardy perennial by Penny)

An alternative answer is: 91 = 3^3 + 4^3 = (-5)^3 + 6^3.

Posted by Nick Hobson on 2005-09-25 22:09:08