n is a integer number . Prove that number is not integer number .
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Originally Posted by dhiab n is a integer number . Prove that number is not integer number . A perfect cube must be congruent to 0, 1, or 8 (mod 9). Here is a table of n and its corresponding $\displaystyle 3n^2+3n+7$ (mod 9). 0, 7 1, 4 2, 7 3, 7 4, 4 5, 7 6, 7 7, 4 8, 7 This list is exhaustive, and constitutes a proof.
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