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- - Pi (https://thetfp.com/tfp/tilted-knowledge-how/16614-pi.html)

Im not sure how to calculate it exactly, but i remember doing a program for high school Visual Basic that could calculate pi to 500,000 digits... computers can do it as 4.0 * arctan(1.0) but i have no idea what arctan is

arctan is the inverse function of tangent.

like how tan(pi/4) = 1, acrtan(1) = pi/4.

I once downloaded a text file containing pi to around 6-billion digits. I also once made the mistake of opening this text file. Took about 15 minutes to load it into memory :thumbsup:

This is awesome, an actual algorithm for finding pi

Quote:

1. Initial value setting;
a = 1 b = 1 / SqRt(2) t = 1/4 x = 1

2. Repeat the following statements until the difference of a and b is within the desired accuracy;
y = a
a = (a+b) / 2
b = SqRt(b*y)
t = t - x * (y-a)^2
x = 2 * x

3. Pi is approximated with a, b and t as;
Pi = ((a+b)^2) / (4*t)

Link

If I had the desire to, I'd toss this into my C compiler right now and run it, but nah...

Apparently the record is 206,158,430,000 accurate digits of pi, held by Y. Kanada and D. Takahashi. Figures they'd be Japanese :thumbsup:

If you want to see pi to 206,158,430,000 digits really bad, go here and help yourself. It's pretty damn slow, though. I estimate the total size to be around:

201326592 Kb, which would be...
196608 Mb, which would be...
192 Gb

Who the hell wants to fill up a really, really expensive hard drive with nothing but pi? :crazy:

i memorized part of Pi one day out of boredom

3.141592653

now I have memorized more

3.14159265358979323

Thanks guys!

I saw a video clip of a guy who had memorized it to several thousand places. You could read him a series of numbers from any spot, and he could continue from that point on (much like hearing a beat or lyrics from a song).

-Jeff