

A280004


Numbers n such that 9*2^n + 1 is a prime factor of a Fermat number 2^(2^m) + 1 for some m.


1




OFFSET

1,1


LINKS

Table of n, a(n) for n=1..4.
Proth Search Page, Prime factors of Fermat numbers
Eric Weisstein's World of Mathematics, Fermat Number


CROSSREFS

Subsequence of A002256.
Cf. A000215, A050528, A057778, A201364, A204620, A226366, A280003.
Sequence in context: A328353 A078989 A156121 * A211961 A144940 A211962
Adjacent sequences: A280001 A280002 A280003 * A280005 A280006 A280007


KEYWORD

nonn,hard,more


AUTHOR

Arkadiusz Wesolowski, Feb 21 2017


STATUS

approved



