Record history of Cunningham Chain length 7

first member Digits When? Discoverer

1st kind
 
82466536397303904 ⋅ 1171# - 1
509
1 Jan 2016
Balyakin
3931472185692005387730944 ⋅ 857# - 1
381
25 May 2015
Balyakin
14317181455772 ⋅ 853# - 1
367
24 Jul 2014
Batalov, NewPGen, OpenPFGW
162597166369 ⋅ 827# - 1
356
Jul 2010
Augustin, NewPGen, OpenPFGW
1178137903623 ⋅ 661# - 1
291
Jul 2008
Augustin, NewPGen, OpenPFGW
14180848107 ⋅ 487# - 1
211
Nov 2004
Augustin, NewPGen, OpenPFGW
472063086 ⋅ 383# + 1236845609
165
May 2004
Alm, Andersen, Primo
406605710992 ⋅ 349# - 1
153
Jun 2002
Augustin, NewPGen, OpenPFGW
1953370903 ⋅ 151# - 1
69
Jun 2000
Augustin, NewPGen, OpenPFGW
460668119835 ⋅ 2101 - 1
43
Dec 1999
Jobling
27215953890276787 ⋅ 37# ⋅ 23 - 1
31
Nov 1999
Augustin, Jobling, Primeform
27215953890276787 ⋅ 37# ⋅ 23 - 1
31
Nov 1999
Augustin, Jobling, Primeform

2nd kind
 
25802590081726373888 ⋅ 1033# + 1
453
17 Dec 2015
Balyakin
4746015693360635904 ⋅ 761# + 1
337
10 Mar 2016
Balyakin
535617118876 ⋅ 727# + 1
313
6 Dec 2015
Östlin, NewPGen, OpenPFGW
668302064 ⋅ 593# + 786153598231
251
May 2008
Wolter, Andersen, Primo
414792720846 ⋅ 557# + 1
237
Mar 2006
Augustin, NewPGen, OpenPFGW
782350985 ⋅ 503# + 2189997811
218
Feb 2006
Andersen, Primo
2310290388 ⋅ 283# + 1
128
Sep 2001
Augustin, NewPGen, OpenPFGW
1701815519 ⋅ 277# + 1
123
Aug 2000
Augustin, NewPGen, OpenPFGW
843616025 ⋅ 193# + 1
87
Jul 2000
Augustin, NewPGen, OpenPFGW
666325605 ⋅ 260 + 1
27
Oct 1999
Augustin, Proth