Numbers whose Divisor Sum is Square/Examples/22

Example of Number whose Divisor Sum is Square

$\map {\sigma_1} {22} = 36 = 6^2$

Proof

From $\sigma_1$ of $22$:

$\map {\sigma_1} {22} = 36$

which equals $6^2$.

$\blacksquare$

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $22$