Square Numbers which are Divisor Sum values/Mistake

Source Work

1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary

$36$

Mistake

The sequence of squares which are values of $\map \sigma n$ goes: $1 \ \ 4 \ \ 36 \ \ 121 \ \ 144 \ \ 256 \ \ 576 \ \ldots$

Correction

$400$ is missing from this list.

Sources

• 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $36$