1,111,111,111/Mistake
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Source Work
1986: David Wells: Curious and Interesting Numbers:
- The Dictionary
- $297$
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $297$
Mistake in First Edition
- So is $1,111,111,111$ [a Kaprekar number ], the smallest Kaprekar number of $10$ digits whose square is $12345678900987654321$.
Mistake in Second Edition
- So is $1,111,111,111$ [a Kaprekar number ], the smallest Kaprekar number of $10$ digits whose square is $12, 345, 671, 900, 987, 654, 321$.