Multiple choice general knowledge math & puzzles

The numbers 3, 7, 31, and 127 are what?

  1. Mersenne Primes

  2. Leibniz Primes

  3. fermat Primes

  4. Newton Primes
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A Correct answer
Explanation

Mersenne primes are prime numbers of the form $2^n - 1$. Here, $3 (2^2-1)$, $7 (2^3-1)$, $31 (2^5-1)$, and $127 (2^7-1)$ all fit this definition. Fermat primes follow a different formula ($2^{2^n}+1$).

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