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Fermat number

Positive integer of the form (2^(2^n))+1In mathematics, a Fermat number, named after Pierre de Fermat (1601–1665), the first known to have studied them, is a positive integer of the form: Fn=22n+1,{\displaystyle F_{n}=2^{2^{n}}+1,} where n is a non-negative integer.

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