Quadruply Perfect Number/Examples/30,240

Example of Quadruply Perfect Number

$30 \, 240$ is quadruply perfect:

$\map {\sigma_1} {30 \, 240} = 120 \, 960 = 4 \times 30 \, 240$

Proof

From $\sigma_1$ of $30 \, 240$:

$\map {\sigma_1} {30 \, 240} = 120 \, 960$

Hence the result.

$\blacksquare$

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $30,240$