Multiple choice general knowledge math & puzzles

  1. The first four Fibonacci numbers that are also prime are 2, 3, 5 and 13. I am the next prime Fibonacci number. What number am I?

  1. 19

  2. 89

  3. 79

  4. 29
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Fibonacci sequence continues: 21, 34, 55, 89, 144... Of these, 21, 34, 55 are not prime. The number 89 is prime and is the next prime Fibonacci number after 13. 79 is not a Fibonacci number.

AI explanation

The Fibonacci sequence runs 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144... Checking which of these are prime: 2 is prime, 3 is prime, 5 is prime, 8 is not (2³), 13 is prime — giving the first four Fibonacci primes as 2, 3, 5, 13, matching the question's premise. Continuing the sequence: 21 (=3×7, not prime), 34 (=2×17, not prime), 55 (=5×11, not prime), 89 — which is prime (not divisible by any prime up to its square root, ~9.4). So 89 is the next Fibonacci prime after 13, correctly matching the answer. 19, 79, and 29 are primes but don't appear in the Fibonacci sequence at all.

Keep practicing — related questions