Abstract
Let $U$ be an integer with $U>1$. If $n$ is even with $n\geq 6$, then the class number of $\mathbf{Q}(\sqrt{1-4U^{n}})$ is divisible by $n$ except $(U,n)=(13,8)$.
Citation
Katsumasa Ishii. "On the divisibility of the class number of imaginary quadratic fields." Proc. Japan Acad. Ser. A Math. Sci. 87 (8) 142 - 143, October 2011. https://doi.org/10.3792/pjaa.87.142
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