A290200 Prime numbers of the form 4^k + 1.

2, 5, 17, 257, 65537

Offset

1,1

Comments

Similar to Fermat primes, A019434, a(n) is of the form (2^2)^k + 1.

Links

Table of n, a(n) for n=1..5.

Mathematica

Select[4^Range[0, 100] + 1, PrimeQ]

Crossrefs

Cf. A019434, A092506.

Sequence in context: A096848 A283107 A269834 * A132198 A269835 A111635

Adjacent sequences: A290197 A290198 A290199 * A290201 A290202 A290203

Keyword

nonn,more

Author

Robert Price, Jul 23 2017

Status

approved