2 problems

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Unbounded denominators conjecture for noncongruence modular forms
Unbounded denominators conjecture. The Fourier coefficients of $f$ have unbounded denominators. Equivalently, for every positive integer $n$ , the Fourier coefficients of $nf$ are n…
Conjecturesolvedfourier-coefficients modular-forms noncongruencearXiv posted 2 days ago
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Noncongruence conjecture for nonabelian finite simple groups
Noncongruence conjecture. Every nonabelian finite simple group $G$ is noncongruence.
Conjecturesolvedfinite-groups modular-curves noncongruencearXiv posted 2 days ago

Unbounded denominators conjecture for noncongruence modular forms