19

This number is a prime.

Just showing those entries submitted by 'McAlee': (Click here to show all)

Professor Barabási and his team have found that the World Wide Web on average has 19 clicks of separation between webpages. [McAlee]

Article 19 of the Universal Declaration of Human Rights: "Everyone has the right to the freedom of opinion and expression; this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers." [McAlee]

19 is the smallest prime with a digital root of 1. [McAlee]