Fermat primes from 1 to 10000

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2^2^n + 1
Unsolved problem : Are there an infinite number of Fermat primes ?
Unsolved problem : Are there infinitely many composite Fermat numbers ?
Unsolved problem : Is Fn composite for all n > 4 ?
3
5
17
257
65537
Fermat numbers
3　=　220 + 1
prime number
5　=　221 + 1
prime number
17　=　222 + 1
prime number
257　=　223 + 1
prime number
65537　=　224 + 1
prime number
4294967297　=　225 + 1
= 641 * 6700417
18446744073709551617　=　226 + 1
= 274177 * 67280421310721
340282366920938463463374607431768211457　=　227 + 1
= 59649589127497217 * 5704689200685129054721
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