Owlet puzzle #4
Released Thursday, July 9, 2026 UTC
6174
the answer for puzzle #4
The five clues
- A four-digit multiple of eighteen, digit sum eighteen.
- All four digits are distinct.
- Fixed point of a famous digit-arrangement routine.
- Named for an Indian mathematician who discovered the fixed point in 1949.
- Kaprekar's constant.
Backstory
6174 is Kaprekar's constant: for any four-digit number with at least two distinct digits, subtracting the ascending-sorted from the descending-sorted digits and iterating lands on 6174 in at most seven steps. Kaprekar published this fixed point in 1949.
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