[Dr. Zzyzx]

You only need 39 or 40 digits of pi to calculate the circumference of the observable universe to within the width of a hydrogen atom.

https://www.vox.com/2016/4/2/11350518/nasa-digits-pi

[NobleFree]

But 25 more to get within one Planck length.

[Hot Tabasco]

You only need 39 or 40 digits of pi to calculate the circumference of the observable universe to within the width of a hydrogen atom.

Why would you do that unless you were a FR junky who has nothing to do at home but spend your day on this website?

With that being said, what would you get if you used 187 digits of pi?