Numbers whose Divisor Sum is Square/Examples/22
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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): $22$