Owlet puzzle #13
Released Saturday, July 18, 2026 UTC
12321
the answer for puzzle #13
The five clues
- A five-digit palindrome.
- A perfect square.
- The square of a three-digit repunit.
- 111² = ?
- The palindrome pattern extends: 1²=1, 11²=121, 111²=12321.
Backstory
Palindromic-repunit-square pattern breaks at 1111² = 1234321 (still fine) and finally at 11111111² = 123456787654321... breaks at ninth.
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