Giuga Number/Examples/858

Example of Giuga Number
$858$ is a Giuga number:
 * $\dfrac 1 2 + \dfrac 1 3 + \dfrac 1 {11} + \dfrac 1 {13} - \dfrac 1 {858} = 1$

Proof
We have that:
 * $858 = 2 \times 3 \times 11 \times 13$

Then:

Hence the result by definition of Giuga number.