858

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Number

$858$ (eight hundred and fifty-eight) is:

$2 \times 3 \times 11 \times 13$


The $2$nd Giuga number:
$\dfrac 1 2 + \dfrac 1 3 + \dfrac 1 {11} + \dfrac 1 {13} - \dfrac 1 {858} = 1$


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