Fermat primes up to 20581

Fermat primes: Primes of the form 2^(2^n) + 1.

There is 4 fermat primes smaller than 20581.

Checkout fermat primes up to: 100, 500, 1000, 10000.

List#

3, 5, 17, 257

Table#

 1234
1 - 43517257
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