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Record history of Cunningham Chain length 6
first member	Digits	When?	Discoverer
1st kind
2799873605326 • 2371# - 1	1016	25 Mar 2015	Batalov, NewPGen, OpenPFGW
37488065464 • 1483# - 1	633	Mar 2010	Augustin, NewPGen, OpenPFGW
1882807711450 • 1327# - 1	578	21 Jul 2014	Batalov, NewPGen, OpenPFGW
33692909611 • 977# - 1	417	Oct 2004	Augustin, NewPGen, OpenPFGW
716250935 • 491# - 1	213	Sep 2001	Augustin, NewPGen, OpenPFGW
620060805 • 2252 - 1	85	26 Oct 1999	Augustin, Proth
505054485 • 2154 - 1	56	19 Oct 1999	Augustin, Proth
2nd kind
52992297065385779421184 • 1531# + 1	668	15 May 2015	Balyakin
480112483568 • 1511# + 1	650	10 Mar 2014	Östlin, NewPGen, OpenPFGW
37783362904 • 1097# + 1	475	Jun 2006	Augustin, NewPGen, OpenPFGW
703632724 • 787# + 94265010841	336	Sep 2004	Andersen, Primo
42693782492 • 739# + 1	318	Sep 2004	Augustin, NewPGen, OpenPFGW
2197316072 • 647# + 105063678721	279	Sep 2004	Andersen, Primo
6302319587 • 509# + 1	222	Jan 2003	Chaffey
1056231420 • 479# + 1	208	Aug 2000	Augustin, NewPGen, OpenPFGW
388562456 • 331# + 1	142	20 Jun 2000	Augustin, NewPGen, OpenPFGW
2 • 305372608 • 271# + 1	120	3 Jun 2000	Augustin, NewPGen, OpenPFGW