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Dec 24, 2021 at 14:47 comment added Chris Wuthrich oops, that included $p=2$ as well. 1481 of all 16450 rank 0 isogeny classes of conductor < 10000 are counter-examples. The smallest is 114c with $p=5$.
Dec 24, 2021 at 11:46 comment added Chris Wuthrich Firstly, this is wrong if the rank is positive. Then just take an isogeny class only containing one curve (the most frequent case) of rank 0 and look at your rational number. Chances are good that a good ordinary prime divides the numerator, because there is a Tamagawa number divisible by such a prime or the order of the Tate-Shafarevich group is. Somehow I would conjecture the opposite, that a good proportion of curves there is a prime that is a counter example to it. Of the first 7926 single rank 0 curves, 1215 fail your "conjecture".
Dec 24, 2021 at 4:30 vote accept Adithya Chakravarthy
Dec 24, 2021 at 3:04 answer added LeechLattice timeline score: 2
Dec 24, 2021 at 2:25 history asked Adithya Chakravarthy CC BY-SA 4.0