1722

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Number

$1722$ (one thousand, seven hundred and twenty-two) is:

$2 \times 3 \times 7 \times 41$

The $3$rd Giuga number:

$\dfrac 1 2 + \dfrac 1 3 + \dfrac 1 7 + \dfrac 1 {41} - \dfrac 1 {1722} = 1$

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