Usually means: Numbers of form (2^{2^n} + 1).
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We found 5 dictionaries that define the word Fermat number:

General (2 matching dictionaries)
  1. Fermat number: Wikipedia, the Free Encyclopedia
  2. Fermat number: Wiktionary

Computing (1 matching dictionary)
  1. Fermat number: Encyclopedia

Science (2 matching dictionaries)
  1. Fermat Number: Eric Weisstein's World of Mathematics
  2. Fermat number: Prime

Definitions from Wiktionary (Fermat number)

noun:  (number theory) An integer which is one more than two raised to a power which is itself a power of two (i.e., is expressible in the form 2^(2ⁿ)+1 for some n>0); equivalently, a number that is one more than two raised to some power (is expressible as 2ⁿ+1) and is prime.

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