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A031588
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that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 90.
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8102, 8114, 8126, 8158, 8166, 8182, 8194, 8198, 8222, 8254, 8258, 8262, 8278, 8302, 8306, 8318, 8338, 8342, 8402, 8406, 8414, 8422, 8434, 8438, 8454, 8462, 18228, 18237, 18273, 18291, 18294, 18366, 18372, 18393, 18399, 18417, 18429, 18453, 18489, 18507
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