# Interesting approximations? ($\pi$, $e$, etc.?)

I think it'd be cool to see a list of neat approximations of mathematical constants, interesting convergent sequences of functions, links to Ramanujan's notebooks...! Post your favorites!

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Apart from this and this? –  Ｊ. Ｍ. Apr 30 '11 at 0:26
See also the book Mathematical Constants by Steven R. Finch. Also here. –  lhf Apr 30 '11 at 0:39
Is there a question here? –  Fixee Apr 30 '11 at 1:14
The first approximation to e given in JM's link is indeed absolutely amazing! –  Fernando Martin Apr 30 '11 at 4:25