List of champions for factoring Cunningham numbers:

Elliptic curve method:
3843	P47	5,256+	P. Montgomery (CWI)
4166	P45	2,599-	P. Zimmermann

Largest penultimate prime factor (ultimate factor shown also):
3980	p80*p87	 3,349-	   NFSNET
4057	p75*p105 12,167+   CWI

	First five holes in each table on March 23, 1998:

2,589-	c148	2,601-	c170	2,611-	c163	2,613-	c168	2,617-	c171
2,587+	c151	2,589+	c150	2,611+	c123	2,613+	c185	2,617+	c170
2,1118L	c152	2,1138L	c164	2,1154M	c124	2,1174L	c172	2,1186L	c147
2,592+	c174	2,608+	c149	2,628+	c141	2,632+	c177	2,644+	c119

3,373-	c178	3,379-	c155	3,389-	c168	3,397-	c178
3,349+	c144	3,358+	c155	3,361+	c164	3,362+	c172	3,374+	c153

5,299-	c171	5,301-	c159	5,307-	c187	5,575M	c122	5,595M	c135
5,242+	c150	5,248+	c156	5,251+	c165	5,257+	c174	5,272+	c167

6,221-	c139	6,227-	c150	6,251-	c157	6,253-	c153	6,257-	c173
6,218+	c130	6,227+	c127	6,232+	c175	6,233+	c175	6,235+	c144

7,211-	c173	7,227-	c192	7,233-	c155	7,235-	c156	7,241-	c161
7,208+	c155	7,211+	c170	7,214+	c150	7,223+	c148	7,226+	c181

10,173-	c154	10,197-	c169	10,211-	c211	10,215-	c166	10,217-	c174
10,181+	c158	10,184+	c176	10,191+	c156	10,194+	c190	10,196+	c158

11,167-	c128	11,169-	c151	11,187-	c143	11,191-	c193	11,199-	c173
11,167+	c164	11,172+	c130	11,181+	c155	11,184+	c132	11,188+	c184

12,163-	c120	12,173-	c152	12,179-	c190	12,185-	c156	12,191-	c190
12,169+	c132	12,172+	c169	12,173+	c171	12,178+	c145	12,185+	c156