See below for recent champions and first five holes in each table.

List of old champions for factoring Cunningham numbers:

Continued fraction method:
1692	C63	5,171+	K. McCurdy & M. C. Wunderlich on the MPP
1602	C62	3,204+	J. W. Smith & S. S. Wagstaff, Jr. on the EPOC

SPAR:
1066	C60	3,131+	A. O. L. Atkin & N. W. Rickert on a large IBM
941	C59	12,59-	A. O. L. Atkin & N. W. Rickert on a large IBM

Pollard p-1:
5267	P58	2,2098M	P. Zimmermann
4871	P57	6,396+	P. Zimmermann

p-1/FFT:
2590	P28	2, 733+	R. Silverman on an Alliant
2550	P27	2,1008+	R. Silverman on an Alliant

p+1:
0	P21	2,439-	R. P. Brent on a Univac 1100/82
5	P20	2,509-	R. P. Brent on a Univac 1100/82

Brent-Pollard rho:
1343	P19	2,2386L	H. Dubner on a special processor
1254	P19	2,1049- H. Dubner on a special processor

Quadratic sieve method:
4682	C135	2,1606L	Dodson, A.K.Lenstra, Leyland, Muffett, Wagstaff
4564	C124	2,895-	Jens Franke

Hybrid Special/General number field sieve by size of number factored:
4083	C123	2,1155+	CWI
4036	C121	2,1650L	CWI


List of recent champions for factoring Cunningham numbers:

Special number field sieve by size of number factored:
6297	C355	2,1193-	J.Bos+T.Kleinjung+A.K.Lenstra
6315	C342	2,1171-	J.Bos+T.Kleinjung+A.K.Lenstra

Special number field sieve by SNFS difficulty:
6297	C355	2,1193-	J.Bos+T.Kleinjung+A.K.Lenstra
6315	C342	2,1171-	J.Bos+T.Kleinjung+A.K.Lenstra

General number field sieve by size of number factored:
6665	C221	2,2246M	NFS@Home+mersenneforum
6319	C221	3,697+	NFS@Home

Elliptic curve method:
6208	P83	7,337+	R. Propper
6135	P79	11,306+	S. Wagstaff

Largest penultimate prime factor (ultimate factor shown also):
6630	p151*p160 7,889M    NFS@Home
6537	p147*p156 12,293+   NFS@Home

	First five holes in each table on July 27, 2023

2,1207-	c337	2,1213-	c297	2,1217-	c248	2,1229-	c284	2,1231-	c329
2,1123+	c338	2,1129+	c330	2,1139+	c248	2,1147+	c317	2,1151+	c236
2,2246L	c253	2,2266L	c255	2,2278M	c234	2,2302L	c293	2,2306L	c287
2,1124+	c311	2,1136+	c247	2,1168+	c326	2,1208+	c330	2,1216+	c263

3,691-	c265	3,703-	c269	3,715-	c211	3,725-	c217	3,731-	c265
3,692+	c277	3,701+	c302	3,709+	c327	3,712+	c330	3,716+	c264

5,503-	c260	5,509-	c271	5,521-	c364	5,529-	c281	5,533-	c336
5,467+	c230	5,472+	c317	5,478+	c311	5,479+	c224	5,488+	c301

6,421-	c281	6,431-	c321	6,437-	c273	6,439-	c293	6,445-	c259
6,419+	c261	6,421+	c246	6,431+	c331	6,436+	c258	6,439+	c270

7,389-	c299	7,395-	c220	7,419-	c214	7,421-	c305	7,425-	c221
7,386+	c245	7,388+	c314	7,395+	c221	7,397+	c300	7,398+	c332

10,353-	c328	10,365-	c288	10,377-	c311	10,383-	c230	10,389-	c270
10,332+	c295	10,346+	c300	10,347+	c318	10,353+	c300	10,356+	c292

11,313-	c273	11,317-	c319	11,331-	c344	11,341- c289	11,349-	c294
11,311+	c247	11,326+	c334	11,328+	c242	11,331+	c258	11,332+	c282

12,311-	c335	12,313-	c283	12,319-	c260	12,331-	c290	12,337-	c265
12,307+	c304	12,326+	c347	12,328+	c301	12,331+	c241	12,332+	c289