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This cusp form can be expressed as an eta product $\eta(z)\eta(3z)\eta(5z)\eta(15z)=q\prod_{n=1}^\infty(1-q^n)(1-q^{3n})(1-q^{5n})(1-q^{15n})$, where $q=e^{2\pi iz}$.

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  • Last edited by Andrew V. Sutherland on 2016-07-11 21:30:50.114000