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A051985
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Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 20.
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511, 559, 606, 790, 1002, 1065, 1079, 1182, 1195, 1374, 1415, 1510, 1513, 1537, 1603, 1687, 1961, 2193, 2215, 2455, 2471, 2627, 2863, 3155, 3239, 3295, 3383, 3647, 3746, 3857, 4163, 4295, 4458, 4535, 4595, 4727, 4782, 4847, 4922, 5038
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