$$\frac{506\times42025}{40}$$
$\frac{2126465}{4}=531616.25$
$$\frac{21264650}{40}$$
$$\frac{2126465}{4}$$
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$\frac{5 \cdot 11 \cdot 23 \cdot 41 ^ {2}}{2 ^ {2}} = 531616\frac{1}{4} = 531616.25$
