$e=lim_{n\to\infty}\sqrt[p_n]{\prod_{k=1}^np_n}$
as seen at Gaussianos
$(\prod_{k=1}^np_n=p_n$# which is the primorial of the nth prime number $p_n)$
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I could not write correctly the primorial under the square root so I edited it again; added 21 characters in body
fgfinat
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fgfinat
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