math: 537
stackoverflow: 374
askubuntu: 121
superuser: 79
codegolf: 79
physics: 74
english: 55
serverfault: 53
apple: 41
electronics: 27
gaming: 26
unix: 25
security: 24
drupal: 23
interpersonal: 22
mathoverflow.net: 21
graphicdesign: 19
islam: 19
wordpress: 18
android: 18
magento: 17
meta: 16
bitcoin: 16
ru.stackoverflow: 16
ethereum: 15
dba: 14
mathematica: 14
chemistry: 14
stats: 13
salesforce: 13
rpg: 13
ell: 13
tex: 11
money: 11
travel: 11
diy: 10
webapps: 10
puzzling: 10
aviation: 9
gis: 9