$$\frac { 231 \times 231 - 180 \times 180 } { 41 }$$
$\frac{20961}{41}\approx 511.243902439$
$$\frac{53361-180\times 180}{41}$$
$$\frac{53361-32400}{41}$$
$$\frac{20961}{41}$$
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$\frac{3 ^ {2} \cdot 17 \cdot 137}{41} = 511\frac{10}{41} = 511.2439024390244$
