$$+an^{-1}\cdot(\frac{93.99}{143\cdot541})$$
$\frac{723a}{595100n}$
$$an^{-1}\times \frac{93.99}{77363}$$
$$an^{-1}\times \frac{9399}{7736300}$$
$$an^{-1}\times \frac{723}{595100}$$
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$\frac{723}{595100n}$