Kaprekar's Process for 2-Digit Numbers/Mistake
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Source Work
1986: David Wells: Curious and Interesting Numbers:
- The Dictionary
- $63$
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $63$
Mistake
- Kaprekar's process for $2$-digit numbers leads to the cycle $63 - 27 - 45 - 9 - 81 \ldots$
The statement needs to specify that the $2$-digit numbers do not include repdigit numbers, as for example:
- $\map K {11} = 11 - 11 = 0$
trivially.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $63$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $63$