517,842/Mistake

Source Work

 * The Dictionary
 * $147,852$
 * $147,852$

Mistake

 * The digits $147852$ in various orders that are not permutations of the period of $1/7$ occur in several other products also. For example, $666 \times 777 = 517,842$ and $333 \times 777 = 258,741$.

$666 \times 777 = 517,482$ not $517,842$.

And technically, $147852$ is a permutation of the period of $1/7$ -- just not a cyclic permutation of it.