Giuga Number/Examples/1722

Example of Giuga Number
$1722$ is a Giuga number:
 * $\dfrac 1 2 + \dfrac 1 3 + \dfrac 1 7 + \dfrac 1 {41} - \dfrac 1 {1722} = 1$

Proof
We have that:
 * $1722 = 2 \times 3 \times 7 \times 41$

Then:

Hence the result by definition of Giuga number.