#### Vol. 13, No. 5, 2020

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Eta-quotients of prime or semiprime level and elliptic curves

### Michael Allen, Nicholas Anderson, Asimina Hamakiotes, Ben Oltsik and Holly Swisher

Vol. 13 (2020), No. 5, 879–900
##### Abstract

From the modularity theorem proven by Wiles, Taylor, Conrad, Diamond, and Breuil, we know that all elliptic curves are modular. It has been shown by Martin and Ono exactly which are represented by eta-quotients, and some examples of elliptic curves represented by modular forms that are linear combinations of eta-quotients have been given by Pathakjee, RosnBrick, and Yoong.

In this paper, we first show that eta-quotients which are modular for any congruence subgroup of level $N$ coprime to $6$ can be viewed as modular for ${\Gamma }_{0}\left(N\right)$. We then categorize when even-weight eta-quotients can exist in ${M}_{k}\left({\Gamma }_{1}\left(p\right)\right)$ and ${M}_{k}\left({\Gamma }_{1}\left(pq\right)\right)$ for distinct primes $p,q$. We conclude by providing some new examples of elliptic curves whose corresponding modular forms can be written as a linear combination of eta-quotients, and describe an algorithmic method for finding additional examples.

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##### Keywords
eta-quotients, modular forms, elliptic curves
##### Mathematical Subject Classification
Primary: 11F20, 11F37
Secondary: 11G05