Triperfect Number/Examples/672

Example of Triperfect Number

$672$ is triperfect:

$\map {\sigma_1} {672} = 2016 = 3 \times 672$

Proof

From $\sigma_1$ of $672$:

$\map {\sigma_1} {672} = 2016$

Hence the result.

$\blacksquare$

Sources

• 1919: Leonard Eugene Dickson: History of the Theory of Numbers: Volume $\text { I }$ ... (previous) ... (next): Preface