Owlet puzzle #70
Released Sunday, September 13, 2026 UTC
13
the answer for puzzle #70
The five clues
- A two-digit prime under twenty.
- A prime Fibonacci number.
- The number of cards in a suit of playing cards.
- F(7) — the 7th Fibonacci number.
- Considered unlucky in Western tradition; the fear of it is triskaidekaphobia.
Backstory
13 is prime, Fibonacci (F₇), and the smallest emirp (prime that becomes a different prime when reversed): 31 is also prime. It's the number of Archimedean solids in three dimensions, and the smallest prime whose square (169) is also a repunit-adjacent palindrome in base 10.
▶ Play puzzle #70 in practice mode
Or try today's fresh puzzle · Browse the full archive