109

This number is a prime.

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109 is the sum of the first four prime-indexed Fibonacci primes (2 + 5 + 13 + 89), and is itself prime. In Zeckendorf representation: 109 = F₃ + F₅ + F₇ + F₁₁. [Ahmed]

Submitted: 2026-06-23 00:53:24; Last Modified: 2026-06-23 00:58:45.