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Mar 6, 2017 at 13:56 vote accept User0829
Mar 6, 2017 at 12:36 comment added User0829 Thank you very much. So, the confusion arose when I translate the real question I have in mind into using geometry. What I have really wondered is the following: if $P$ is an $\ell$-torsion point. whether its $x$-coordinate, say $x(P)$, has prime factor only $\ell$ or not. But, as is in your example, it is possible.
Mar 6, 2017 at 12:27 history answered David Loeffler CC BY-SA 3.0