Alex Ghitza

Distinguishing eigenforms modulo a prime ideal

S. Chow, A. Ghitza

Funct. Approx. Comment. Math. 51, no. 2 (2014), 363-377.

Let $n_0(N,k)$ be the number of initial Fourier coefficients necessary to distinguish newforms of level $N$ and even weight $k$. We produce extensive data to support our conjecture that if $N$ is a fixed squarefree positive integer and $k$ is large then $n_0(N,k)$ is the least prime that does not divide $N$.

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