OFFSET
0,6
COMMENTS
LINKS
Lorenzo Sauras-Altuzarra, Some properties of the factors of Fermat numbers, Art Discrete Appl. Math. (2022).
FORMULA
Conjecture: a(n) ~ 2^n as n -> oo.
EXAMPLE
For n=5, the smallest prime factor of F(5) = 2^(2^5) + 1 is 641 and it falls between 2^(2^5 - 23) = 512 < 641 < 1024 = 2^(2^5 - 22) so that a(5) = 23.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Lorenzo Sauras Altuzarra, Nov 26 2022
STATUS
approved