Question

If x^3+y^3=z^3 has a solution in integers x, y, z, show that one of the three must be a multiple of 7.

How should I solve this question?

Thank you very much.

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- Jan 3rd 2007, 12:14 PMJenny20x^3+y^3=z^3
Question

If x^3+y^3=z^3 has a solution in integers x, y, z, show that one of the three must be a multiple of 7.

How should I solve this question?

Thank you very much. - Jan 3rd 2007, 12:22 PMThePerfectHacker