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The unbounded denominator conjecture for the noncongruence subgroups of index $7$. (arXiv:2007.01336v1 [math.NT]) http://arxiv.org/abs/2007.01336
The unbounded denominator conjecture for the noncongruence subgroups of index $7$. (arXiv:2007.01336v1 [math.NT]) http://arxiv.org/abs/2007.01336