1,111,111,111/Mistake/Second Edition

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Source Work

1997: David Wells: Curious and Interesting Numbers (2nd ed.):

The Dictionary
$297$


Mistake

So is $1,111,111,111$ [a Kaprekar number ], the smallest Kaprekar number of $10$ digits whose square is $12, 345, 671, 900, 987, 654, 321$.


The square is incorrect. It should be:

$1,234,567,900,987,654,321$


The mistake is not repeated under the section for $1,111,111,111$ itself, in which the square is given correctly.


In Curious and Interesting Numbers of $1986$, the number $1,111,111,111^2$ was again given incorrectly in Section $297$, but differently:

$12345678900987654321$


Sources