Last Digit of Perfect Numbers Alternates between 6 and 8/Historical Note

Historical Note on Last Digit of Perfect Numbers Alternates between $6$ and $8$
The conjecture that there is Last Digit of Perfect Numbers Alternates between $6$ and $8$ was made by in his, published some time around the $2$nd century.

It was a simple extrapolation from the knowledge of the perfect numbers at the time.

Some sources suggest that made these conjectures, but this appears to be incorrect.