404. That’s an error.

The requested URL /translate_c?depth=1&pto=aue&rurl=translate.google.ru&sl=en&sp=nmt4&tl=ru&u=http://en.wikipedia.org/wiki/Big_O_notation&usg=ALkJrhhk6gP7yuwFm-nBT4C_ayfbD3bkIA was not found on this server. That’s all we know.