Abstract
We prove that the class number of the real quadratic field\({\mathbb{Q}}\left( {\sqrt {a^{2n} + 4} } \right)\) is divisible byn forany integern ≥ 2 andany odd integera ≥ 3.
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Ichimura, H. Note on the class numbers of certain real quadratic fields. Abh.Math.Semin.Univ.Hambg. 73, 281–288 (2003). https://doi.org/10.1007/BF02941283
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DOI: https://doi.org/10.1007/BF02941283