Pi=3/1+15/106+73/877203+1/2195225334+2/17599271777+3/36095005720+7/17348726394920+。...
.
- ------------------------------ ------------- ------
0 0/1 = 0 - -
1 3/1 = 3 3/1 1
2 333/106 = 3.1415094339... 15/106 106
3 103993/33102 = 3.1415926530... 73/877203 877203