History of Cunningham Chain length 18
Initial prime number	Digits	When	Discoverer
2nd kind
658189097608811942204322721	27	8 Mar 2014	Raanan Chermoni, Jaroslaw Wroblewski
182927793839529342111307801	27	8 Mar 2014	Raanan Chermoni, Jaroslaw Wroblewski
117302256313688977973793781	27	8 Mar 2014	Raanan Chermoni, Jaroslaw Wroblewski