# When was the Fermat number $F_{32}$ shown to be composite?

The first few Fermat numbers are $F_{0}=2^{2^0}+1=3$, $F_{1}=2^{2^1}+1=5$, $F_{2}=2^{2^2}+1=17$.

I read that $F_5$ through $F_{32}$ have been shown to be composite. And right now $F_{33}$ is the smallest Fermat number whose primality is unknown.

My question is: When was $F_{32}$ shown to be composite?