List of recent champions for factoring Cunningham numbers:

Special number field sieve by size of number factored:
5501	c307	2,1039-	K.Aoki+J.Franke+T.Kleinjung+A.K.Lenstra+D.A.Osvik
6002	c287	2,997+	NFS@Home+Popovyan
5811	C280	2,941-	mersenneforum+NFS@Home+Dodson+Womack

Special number field sieve by SNFS difficulty:
5501	c307	2,1039-	K.Aoki+J.Franke+T.Kleinjung+A.K.Lenstra+D.A.Osvik
5970	c261	2,1183-	T.Kleinjung
6002	c287	2,997+	NFS@Home+Popovyan

General number field sieve by size of number factored:
5852	C192	2,1175-	J.Bos+T.Kleinjung
6001	C184	2,1040+	NFS@Home
5993	C182	2,1099+	NFS@Home
5723	C182	2,1157-	J.Bos+T.Kleinjung

Elliptic curve method:
5858	P73	2,1181-	J.Bos+T.Kleinjung+A.K.Lenstra+P.Montgomery
5888	P73	2,1163-	J.Bos+T.Kleinjung+A.K.Lenstra+P.Montgomery

Largest penultimate prime factor (ultimate factor shown also):
5714	p128*p140 5,383+    Childers/Dodson
5654	p127*p136 6,392+    Childers/Dodson

	First five holes in each table on March 25, 2010

2,929-	c214	2,947-	c217	2,991-	c264	2,1007-	c254	2,1009-	c204
2,947+	c212	2,961+	c221	2,979+	c255	2,983+	c236	2,989+	c249
2,1814M	c234	2,1822M	c215	2,1838L	c258	2,1846L	c196	2,1874L	c195
2,956+	c187	2,964+	c198	2,1000+	c217	2,1028+	c241	2,1052+	c300

3,589-	c213	3,593-	c214	3,611-	c222	3,613-	c285	3,617-	c277
3,589+	c212	3,592+	c220	3,596+	c243	3,599+	c269	3,604+	c248

5,389-	c231	5,419-	c224	5,431-	c266	5,449-	c271	5,895L	c219
5,394+	c265	5,401+	c236	5,409+	c271	5,419+	c236	5,421+	c250

6,349-	c209	6,373-	c287	6,383-	c264	6,391-	c274	6,401-	c274
6,359+	c234	6,361+	c213	6,362+	c241	6,374+	c214	6,376+	c224

7,323-	c241	7,337-	c213	7,353-	c263	7,359-	c224	7,361-	c290
7,323+	c229	7,326+	c258	7,331+	c253	7,332+	c199	7,334+	c205

10,277-	c224	10,281-	c210	10,283-	c211	10,293-	c218	10,323-	c271
10,274+	c253	10,277+	c259	10,281+	c242	10,284+	c200	10,289+	c217

11,269-	c233	11,271-	c221	11,281-	c210	11,283-	c268	11,289-	c204
11,263+	c252	11,269+	c202	11,271+	c267	11,272+	c201	11,278+	c211

12,257-	c218	12,269-	c205	12,271-	c234	12,277-	c285	12,281-	c294
12,271+	c250	12,274+	c213	12,283+	c194	12,284+	c252	12,289+	c265