10万位:http://www.geom.uiuc.edu/%7Ehuberty/math5337/groupe/digits.html
100万位:https://www.piday.org/million/
10亿位以及12410亿位:https://stuff.mit.edu/afs/sipb/contrib/pi/
来源:https://www.douban.com/note/690141543/?type=collect