Links:
-https://coinmarketcap.com/currencies/primecoin/
-https://en.wikipedia.org/wiki/Primecoin
-https://www.reddit.com/r/primecoin/
-https://twitter.com/primecoin
-https://github.com/primecoin/primecoin/wiki/World-records
News:
-http://www.businessinsider.com/s?q=primecoin
-https://99bitcoins.com/?s=primecoin