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A number of the form EQN:2^{2^n}+1. Pierre de Fermat noticed that the first few are all prime and thought they might all be, but that turns out not to be true. Numbers of this form that /are/ prime are called Fermat primes.

A number of the form EQN:2^{2^n}+1.

Pierre de Fermat noticed that the first few are all prime numbers

and thought they might all be, but that turns out not to be true.

Numbers of this form that /are/ prime are called Fermat primes.