Technically impossible

[qwertysaur]

divide that by 101010101010101010101010101010 !!!!!, 101010101010101010101010101010 !!!!! times. Remember that ! means factorial

Edit: Here is another one. a_n is defined as the largest number raised to the power of (-n).
Then take the following.

The letter pi is similar to Sigma where you add up all the terms in a series, only you have to multiply all the terms, not add them.