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Dec 19, 2022 at 15:04 history bounty ended k.j.
Dec 18, 2022 at 14:05 vote accept k.j.
Dec 15, 2022 at 16:38 comment added David Loeffler Even the case of $J_1(p)$ for $p$ prime is hard.
Dec 15, 2022 at 13:39 comment added Henri Cohen What about $N$ squarefree ?
Dec 15, 2022 at 12:26 history answered David Loeffler CC BY-SA 4.0