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Sep 21 at 16:10 history edited Alexey Ustinov CC BY-SA 4.0
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Sep 20 at 19:41 comment added Alexey Ustinov @MERTON $$\sum_{x=1}^{p-1}\left(\frac{x^4+n x}{p}\right)=\sum_{x=1}^{p-1}\left(\frac{x^{-4}+n x^{-1}}{p}\right)=\sum_{x=1}^{p-1}\left(\frac{1+n x^3}{p}\right)=\left(\frac{n}{p}\right) \sum_{x=0}^{p-1}\left(\frac{x^3+n^{-1}}{p}\right)$$
Sep 20 at 19:18 comment added Alexey Ustinov @MERTON Jacobsthal and Schrutka studied such sums with $p(x)=x^3-ax$, $x^3-b$ and $x^4-a$.
Sep 19 at 18:37 comment added MERTON This paper studies $\sum_i^{p-1} \Big(\frac{p(x)}{p}\Big)$ for polynomials of degree 1, 2, 4 but not 3. So I don't see how this can be related to elliptic curves
Jul 31 at 19:19 history edited Alexey Ustinov CC BY-SA 4.0
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Jul 31 at 14:19 history answered Alexey Ustinov CC BY-SA 4.0