Record history of Cunningham Chain length 18

first member Digits When? Discoverer

1st kind
 
658189097608811942204322721
27
9 Mar 2014
Chermoni, Wroblewski
182927793839529342111307801
27
8 Mar 2014
Chermoni, Wroblewski
159820395443335740374032201
27
23 Mar 2014
Chermoni, Wroblewski