Hi verybody, Is there a proof of: Sum[(i^s - 1), {i, 1, a}] mod( a ) = Sum[(i - 1)^s, {i, 1, a}] mod( a ) a, s positive integers (could be equal). If there is, please tell me.
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exactly (a>s)
and because both sums are taken over complete residue systems . Works also if b.t.w.
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