Record history of Cunningham Chain length 2

first member Digits When? Discoverer

1st kind
 
2618163402417 ⋅ 21290000 - 1
388342
29 Feb 2016
Brown, PrimeGrid, TwinGen, LLR
18543637900515 ⋅ 2666667 - 1
200701
9 Apr 2012
Bliedung, PrimeGrid, TwinGen, LLR
183027 ⋅ 2265440 - 1
79911
Mar 2010
Wu, sgsieve, LLR
648621027630345 ⋅ 2253824 - 1
76424
18 Nov 2009
Jarai, Farkas, Csajbok, Kasza, Jarai
620366307356565 ⋅ 2253824 - 1
76424
2 Nov 2009
Jarai, Farkas, Csajbok, Kasza, Jarai
1068669447 ⋅ 2211088 - 1
63553
17 May 2020
Kwok, PSieve, LLR
99064503957 ⋅ 2200008 - 1
60220
1 Apr 2016
Urushi, LLR
12443794755 ⋅ 2184516 - 1
55555
9 Sep 2021
Batalov, NewPGen, LLR
21749869755 ⋅ 2184515 - 1
55555
9 Sep 2021
Batalov, NewPGen, LLR
14901867165 ⋅ 2184515 - 1
55555
9 Sep 2021
Batalov, NewPGen, LLR
607095 ⋅ 2176311 - 1
53081
Sep 2009
Wu, LLR
48047305725 ⋅ 2172403 - 1
51910
Jan 2007
Underbakke, TwinGen, LLR
137211941292195 ⋅ 2171960 - 1
51780
May 2006
Jarai, Farkas, Csajbok, Kasza, Jarai
4931286045 ⋅ 2152849 - 1
46022
31 Jul 2021
Doornink, TwinGen, LLR
4318624617 ⋅ 2152849 - 1
46022
31 Jul 2021
Doornink, TwinGen, LLR
21195711 ⋅ 2143630 - 1
43245
14 Jun 2019
Batalov, NewPGen, LLR
838269645 ⋅ 2143165 - 1
43106
14 Jun 2019
Batalov, NewPGen, LLR
570409245 ⋅ 2143163 - 1
43106
14 Jun 2019
Batalov, NewPGen, LLR
2830598517 ⋅ 2143112 - 1
43091
4 Jul 2019
Batalov, NewPGen, LLR
4158932595 ⋅ 2143073 - 1
43079
6 Jul 2019
Batalov, NewPGen, LLR
7068555 ⋅ 2121301 - 1
36523
Jan 2005
Predrag Minovic, TwinGen, LLR
2540041185 ⋅ 2114729 - 1
34547
Jan 2003
Underbakke, TwinGen, LLR
18912879 ⋅ 298395 - 1
29628
Nov 2002
Angel, Augustin, Jobling, NewPGen ,OpenPFGW)
1213822389 ⋅ 281131 - 1
24432
Aug 2002
Angel, Augustin, Jobling, NewPGen ,OpenPFGW, Proth)
109433307 ⋅ 266452 - 1
20013
Feb 2001
Underbakke, NewPGen, Proth
3714089895285 ⋅ 260000 - 1
18075
Mar 2000
Indlekofer, Jarai, Wassing
18131 ⋅ 22817# - 1
9853
Jan 2000
Lifchitz
18458709 ⋅ 232611 - 1
9825
1999
KerchnerIII, Proth
14516877 ⋅ 224176 - 1
7285
1999
KerchnerIII, Proth
72021 ⋅ 223630 - 1
7119
1998
Gallot
276311 ⋅ 219003 + 1
5726
1998
Ballinger, Proth
92305 ⋅ 216998 + 1
5122
1998
KerchnerIII, Proth
8069496435 ⋅ 105072 - 1
5082
1995
Dubner
470943129 ⋅ 216352 - 1
4932
1995
Jarai, Indlekofer
5415312903 ⋅ 104526 - 1
4536
1994
Dubner
47013511545 ⋅ 102999 - 1
3010
1993
Dubner
39051 ⋅ 26001 - 1
1812
1987
Keller

2nd kind
 
3622179275715 ⋅ 2256002 + 1
77077
31 May 2020
Szekeres, Magyar, Gevay, Farkas, Jarai
2570606397 ⋅ 2252762 + 1
76099
20 May 2020
Batalov, NewPGen, OpenPFGW
3526667708192 + 1
70021
4 May 2020
Larrson, GeneFer, AthGFNSieve, PrivGfnServer, OpenPFGW
1031571488192 + 1
65647
3 May 2020
Jeppe Stig Nielsen, OpenPFGW
556336461 ⋅ 2211355 + 1
63633
24 May 2019
Batalov, NewPGen, LLR
7775705415 ⋅ 2175115 + 1
52725
20 Dec 2017
Batalov, NewPGen, OpenPFGW
9985628193 ⋅ 2171008 + 1
51489
12 Jul 2016
Nair, NewPGen, LLR
129431439657 ⋅ 2170171 + 1
51238
27 Mar 2015
Batalov, NewPGen, LLR
185688291 ⋅ 2161616 + 1
48660
7 Jan 2015
Rajala, NewPGen, OpenPFGW
1579755 ⋅ 2158712 + 1
47784
17 Jul 2014
Batalov, NewPGen, LLR
648309 ⋅ 2148310 + 1
44652
Jul 2010
Wu, sgsieve, LLR
552903 ⋅ 2136156 + 1
40993
Jun 2010
Wu, sgsieve, LLR
163221 ⋅ 2124600 + 1
37514
Dec 2009
Wu, sgsieve, LLR
532323 ⋅ 2104389 + 1
31430
Nov 2009
Wu, sgsieve, LLR
581627055 ⋅ 293181 + 1
28060
Aug 2009
Augustin, NewPGen, OpenPFGW
3853775193 ⋅ 280000 + 1
24092
May 2007
Nair, NewPGen, LLR
1504084599 ⋅ 278341 + 1
23593
Apr 2004
Sun, PRP, NewPGen, Proth
863710323 ⋅ 252588 + 1
15840
Dec 2003
Sun, PRP, NewPGen, Proth
55003425 ⋅ 250000 + 1
15060
Nov 2003
Chaffy, Proth
164581485 ⋅ 249800 + 1
15000
2003
Chaffy, Proth
675558849 ⋅ 240217 + 1
12116
Nov 2000
Augustin, Jobling, NewPGen, PRP
16769025 ⋅ 234071 + 1
10264
1998
Lifchitz, Gallot
15015 ⋅ 223870 + 1
7190
1993
Young , but recognized as CC2 many years later
2926924 ⋅ 102032 + 1
2039
1992
Dubner
713851138 ⋅ 101854 + 1
1863
1990
Dubner