List of champions for factoring Cunningham numbers:

Special number field sieve by size of number factored:
4057	C180	12,167+	CWI
4285	C178	3,373-	CWI

Special number field sieve by SNFS difficulty:
4057	C180	12,167+	CWI
4286	C176	3,376+	CWI

Elliptic curve method:
4253	P53	2,677-	C. Curry ECMNET
4283	P49	6,250+	M. Quercia ECMNET

Largest penultimate prime factor (ultimate factor shown also):
3980	p80*p87	 3,349-	   NFSNET
4268	p79*p93	 3,362+	   CWI

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

2,601-	c170	2,611-	c163	2,617-	c171	2,619-	c170	2,629-	c174
2,587+	c151	2,611+	c123	2,613+	c185	2,617+	c170	2,619+	c186
2,1174L	c172	2,1186L	c147	2,1198L	c147	2,1202L	c178	2,1214L	c155
2,592+	c174	2,608+	c149	2,628+	c141	2,632+	c177	2,644+	c119

3,379-	c155	3,389-	c168	3,397-	c178	3,431-	c198	3,433-	c149
3,382+	c168	3,386+	c158	3,397+	c162	3,404+	c141	3,407+	c148

5,299-	c131	5,307-	c187	5,311-	c212	5,313-	c210	5,317-	c194
5,251+	c165	5,257+	c174	5,272+	c167	5,283+	c168	5,284+	c196

6,227-	c150	6,251-	c157	6,253-	c153	6,257-	c173	6,259-	c159
6,227+	c127	6,232+	c175	6,233+	c175	6,241+	c184	6,242+	c141

7,211-	c173	7,227-	c192	7,233-	c155	7,241-	c117	7,253-	c177
7,211+	c128	7,214+	c150	7,232+	c171	7,233+	c150	7,239+	c176

10,197-	c169	10,211-	c211	10,215-	c166	10,217-	c174	10,223-	c211
10,181+	c158	10,184+	c176	10,191+	c156	10,194+	c190	10,196+	c158

11,187-	c143	11,191-	c193	11,199-	c173	11,203-	c167	11,209-	c144
11,172+	c130	11,181+	c155	11,188+	c184	11,190+	c150	11,196+	c127

12,173-	c152	12,179-	c190	12,185-	c156	12,193-	c199	12,197-	c212
12,172+	c169	12,173+	c171	12,178+	c145	12,185+	c156	12,188+	c156