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We solve unconditionally the class number one problem for the $2$-parameterfamily of real quadratic fields $\mathbb{Q}(\sqrt{d})$ with square-freediscriminant $d=(an)^2+4a$ for positive odd integers $a$ and $n$.

The class number one problem for the real quadratic fields $\mathbb{Q}\left(\sqrt{(an)^2+4a}\right)$