The number e or Euler's number, is an important mathematical constant approximately equal to 2.71828.
The two possible approximations of e are:
1) The approximation found by R. Sabey in 2004 is correct to 18457734525360901453873570 decimal digits and is given by: ,
2) Another approximation found by Castellanos (1988ab) is good to 6 digits:
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