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23 - 37 is 521.
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Related: 4/3-3/7 2/3-6/7 2/6-3/7 2/3-3/14 6/3-3/7 2/3-9/7 2/9-3/7 2/3-3/21 10/3-3/7 2/3-15/7 2/15-3/7 2/3-3/35 14/3-3/7 2/3-21/7 2/21-3/7 2/3-3/49
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