Definition:Perfect Number/Historical Note/Mistake 2

Source Work

 * The Dictionary
 * $28$
 * $28$

Mistake

 * ..., not unnaturally bearing in mind that he had no conception of the number base $10$ as mathematically arbitrary, conjectured that there was one perfect number for each number of digits, and further that they not only ended in either $6$ or $8$, which is true, but that the $6$s and $8$s alternate, which is not.

The general consensus in the literature agrees that it was who made these conjectures, in his, published some time around the $2$nd century.