[seqfan] Re: More digits of ?

[Simon Plouffe]

The size of the universe is 93 billion light years,
so we need more than 62 digts, maybe 80 ?

Best regards,
Simon Plouffe


Le 2021-09-08 à 12:50, Richard J. Mathar a écrit :
> ada> Date: Mon, 23 Aug 2021 15:01:10 -0400
> ada> From: Alonso Del Arte <alonso.delarte at gmail.com>
> ada> To: Sequence Fanatics Discussion list <seqfan at list.seqfan.eu>
> ada> Subject: [seqfan] More digits of ?
> ada> ...
> ada> Some landscaping companies use ? = 3.14, and twenty digits seems to be
> ada> overkill for most scientific applications.
>
> The number of "applicable" digits of Pi is given by the ratio
> of the radius of the "known" universe (15 billion light years currently)
> over the quantum scale, "Planck length" of 10^-35 m, which is about
> 1.4e61. So 62 digits suffice.
> See e.g. https://en.wikipedia.org/wiki/Observable_universe
> and https://doi.org/10.12942/lrr-2013-2 .
>
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