deletions | additions       diff --git a/The 21 thing.tex b/The 21 thing.tex  index 10e7728..722fd9f 100644  --- a/The 21 thing.tex  +++ b/The 21 thing.tex 
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9901 = \frac{(21;;1)(21;;6)}{(21;;2)(21;;3)} \\  73×137 = 12629 = \frac{(21;;4)}{(21;;2)}  \end{equation}  Also I notice that \begin{equation}  (1;38)=\frac{11×(21;;19)}{3×7}  \end{equation}