1,111,111,111/Mistake/First Edition

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Source Work

1986: David Wells: Curious and Interesting Numbers:

The Dictionary


So is $1,111,111,111$ [a Kaprekar number ], the smallest Kaprekar number of $10$ digits whose square is $12345678900987654321$.


The square is incorrect. It should be:


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, 2nd ed. of $1997$, the number $1,111,111,111^2$ is again given incorrectly in Section $297$, but differently:

$12, 345, 671, 900, 987, 654, 321$