Square of Small Repunit is Palindromic/Mistake/Second Edition

Source Work

 * The Dictionary
 * $1,111,111,111,111,111,111$
 * $1,111,111,111,111,111,111$

Mistake

 * The squares of repunits make a pretty pattern:
 * For example: ... $1,111,111,111^2 = 12,345,678,900,987,654,321$

Correction
That should read:
 * $1,111,111,111^2 = 1,234,567,900,987,654,321$

There is an extra $8$ in its square where it should not be.