Square of Small Repunit is Palindromic/Mistake/First Edition

Source Work

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


 * 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: ... $1111111111111^2 = 12345678900987654321$

Correction
That should read:
 * $1111111111^2 = 1234567900987654321$

The repunit in question is of index $13$, not $10$, and there is an extra $8$ in its square.

The first of these mistakes has been corrected in of $1997$, but not the second.