SOLUTION: Show that any positive integer N = 7 modulo 8 can never be expressed as the sum of the squares of three other positive integers.

SOLUTION: Show that any positive integer N = 7 modulo 8 can never be expressed as the sum of the squares of three other positive integers.

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Question 370027: Show that any positive integer N = 7 modulo 8 can never be expressed as the sum of the squares of three other positive integers.
Answer by Sphinx pinastri(17) (Show Source): You can put this solution on YOUR website!
See the problem 366789
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