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Feb 9, 2011 at 18:23 comment added Hugo Chapdelaine and I should say that for a proper divisor $d|n$ $\#C(\mathbb{F}_{q^d})=q^d+1+(error term)$ so weak estimates imply that $C(\mathbb{F}_{q^n})-\bigcup_{d|n,d\neq n}C(\mathbb{F}_{q^d})$ is larger than 1.
Feb 9, 2011 at 17:44 comment added Hugo Chapdelaine Well now that I think it is obvious. If $C$ is the corresponding curve then we have an exact formula for $\#C(\mathbb{F}_{q^n})$. It is $q^n+1+(error term)$. Nous using weak Weil estimates we are done.
Feb 9, 2011 at 17:42 vote accept Hugo Chapdelaine
Feb 9, 2011 at 14:02 history answered Charles Matthews CC BY-SA 2.5