Fermat primes: primes of the form 2^(2^k) + 1, for some k >= 0.

A019434

Fermat primes: primes of the form 2^(2^k) + 1, for some k >= 0.

Terms

    a(0) =3a(1) =5a(2) =17a(3) =257a(4) =65537

External references