A365640 Prime powers of the form 2^k + 1.

2, 3, 5, 9, 17, 257, 65537

Offset

1,1

Comments

By Mihăilescu's theorem, this is just the union of {2, 9} and the Fermat primes A019434. - Robert Israel, Nov 10 2023

Links

Table of n, a(n) for n=1..7.

Prog

(Magma) [2^k+1: k in [0..1000] | IsPrimePower(2^k+1)];

Crossrefs

Subsequence of A000961. Supersequence of A019434 and A092506.

Sequence in context: A334816 A064769 A320641 * A047021 A201359 A369392

Adjacent sequences: A365637 A365638 A365639 * A365641 A365642 A365643

Keyword

nonn

Author

Juri-Stepan Gerasimov, Nov 10 2023

Status

approved