>>44
Whoops. I did not see that it is a sum of a series. My apologies on that. But wait. Yes, it is a sum of a series, but not the sum of a *geometric* series, where the ratio of any two consecutive terms must be constant. Euler's number does not have a definite geometric series. Which is why it generates such a number to begin with.
0.9999... is a geometric series. It has a definite ratio, unlike the two other constants you mentioned(Yes, they are the sum of a series, but they are not geometric in nature).
Try finding a *geometric* series for Pi, if I were to give the number as a whole, there is no definite way one can put it.