Smallest Penholodigital Square/Mistake

Source Work

 * The Dictionary
 * $11,826$
 * $11,826$

Mistake

 * $11,826^2$ is the smallest pandigital square. It was first noted by in $1727$, who thought it was the only pandigital square.

The book in which called attention to this number actually appeared in $1716$.

It was called, and appeared in a number of editions, one of which may well have been published in $1727$. Research is ongoing as to the exact number of editions, and their dates.