297/Mistake

Source Work

 * The Dictionary
 * $297$
 * $297$

Mistake

 * ''[$297$ is] the $5$th Kaprekar number.

In fact it is the $6$th, if you include the trivial case of $1$:
 * $1, 9, 45, 55, 99, 297$

It might be argued that meant to omit $1$ in his count, but this is then inconsistent with his entry on $45$:
 * The $3$rd smallest Kaprekar number, after $1$ and $9$.