@AlgebraFact @CutTheKnotMath spoiler :) 2009*2011-48=(2010+1)(2010-1)-48=2010^2-1-48=2010^2-7^2=2017*2003 :D
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@AlgebraFact @CutTheKnotMath spoiler :) 2009*2011-48=(2010+1)(2010-1)-48=2010^2-1-48=2010^2-7^2=2017*2003 :D