$e=lim_{n\to\infty}\sqrt[p_n]{p_n}$\#

as seen at [Gaussianos][1]

where $p_n$# is the [primorial][2] of the prime number $p_n$


  [1]: http://gaussianos.com/%25C2%25BFque-tiene-que-ver-el-numero-e-con-los-numeros-primos/%20%22Gaussianos%22
  [2]: http://en.wikipedia.org/wiki/Primorial%20%22Primorial%22