Owlet puzzle #19
Released Friday, July 24, 2026 UTC
39
the answer for puzzle #19
The five clues
- A two-digit odd composite number.
- A two-digit multiple of thirteen greater than twenty-five.
- A two-digit semiprime whose factors are both primes below 20.
- Berry paradox: 'the smallest number without an interesting property' — thereby interesting.
- The atomic number of yttrium (Y) on the periodic table.
Backstory
39 = 3 · 13 is the sum of the five consecutive primes 3 + 5 + 7 + 11 + 13, and appears in the Perrin sequence (3, 0, 2, 3, 2, 5, 5, 7, 10, 12, 17, 22, 29, 39). It's also famous as a candidate for 'smallest uninteresting number' — a paradox that immediately makes it interesting.
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