9801/Mistake
< 9801
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Source Work
1986: David Wells: Curious and Interesting Numbers:
- The Dictionary
- $9801$
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $9801$
Mistake
- $9801 = 99^2$ and $98 + 01 = 99$, so $9801$ is a Kaprekar number.
Correction
By the usual definition, this makes $99$ a Kaprekar number, not $9801$.
The squares of Kaprekar numbers are not considered to be Kaprekar numbers unless they are Kaprekar in their own right.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $9801$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $9801$