Mueen Nawaz wrote:
> Didn't look that up, but the first Skewes number was once believed
> to be the largest number ever used in a proof (or for anywhere useful?):
>
> http://en.wikipedia.org/wiki/Skewes_number
I believe that Graham's number is (significantly!) larger still and
first appeared as a bound in a proof. Hilariously, the lower bound was 6.
http://en.wikipedia.org/wiki/Graham%27s_number
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