A note on the Fourier coefficients of a Cohen-Eisenstein series

Abstract

We prove a formula for the coefficients of a weight $3/2$ Cohen-Eisenstein series of square-free level $N$. This formula generalizes a result of Gross and in particular, it proves a conjecture of Quattrini. Let $l$ be an odd prime number. For any elliptic curve $E$ defined over $\mathbb{Q}$ of rank zero and square-free conductor $N$, if $l\mid |E(\mathbb{Q})|$, under certain conditions on the Shafarevich-Tate group $II{I}_D$, we show that $l$ divides $|II{I}_D|$ if and only if $l$ divides the class number $h(-D)$ of $\mathbb{Q}(\sqrt{-D}).$

arXiv commentTo appear in International Journal of Number Theory

Cited by in corpus (1)

• On the $p$-divisibility of class numbers of an infinite family of imaginary quadratic fields $\mathbb{Q}(\sqrt{d})$ and $\mathbb{Q}(\sqrt{d+1}).$