$\frac{1}{\pi}=\frac{\sqrt{8}}{9801}\sum _{n=0}^{\infty}\frac{\left(4n\right)!}{{\left(n!\right)}^{4}}\left[\frac{26390n+1103}{39{6}^{4n}}\right]$

Right click on the equation and choose Show Source to look at the MathML.

In LaTex (I didn't need to edit this one): $$ \dfrac {1} {\pi }=\dfrac {\sqrt {8}} {9801}\sum _{n=0}^{\infty }\dfrac {\left( 4n\right) !} {\left( n!\right) ^{4}}\left[ \dfrac {26390n+1103} {396^{4n}}\right] $$

Ramanujan's crazy-making identities get mentioned by me a few times in this debate thread on math-teach.

If you're not seeing equations for one-over-pi, click here for a picture of this blog post to see what you're missing -- provided Flickr still exists.