Edit made on February 25, 2010 by ColinWright at 22:31:51
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WW
HEADERS_END
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.