[seqfan] Re: Another approximation of pi

[David Wilson]

On 10/2/2012 6:21 PM, Alonso Del Arte wrote:
> As far as I know, our own Daniel Forgues is the first to notice that
> sqrt(9.87654321) = 3.1426968... which is about as good an approximation of
> pi as 22/7. For some Sequences of the Day in September, to suggest that a
> keyword:cons sequence ought to be chosen, I put in the number 9.87654321
> purely as a placeholder. To my pleasant surprise, Dan added his observation
> to the September 30 entry.
>
> Al
>
Hence pi ~= sqrt(9.87654321) ~= sqrt(200/81) = 20 sqrt(2) / 9.