There are eight threes in the first fifty digits of pi, not including the first three before the decimal point.
Here is an example below with the threes in bold.
3.14159265358979323846264338327950288419716939937510
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51. 51. 51. 51.
Seventeen, with a remainder.
Currently (Sept 2014), the number of digits is 10 trillion (and fifty).
27 threes are in 81
Depends on what they are, and how many total digits.