List of recent champions for factoring Cunningham numbers:

Special number field sieve by size of number factored:
4757	C244	2,809-	Franke/Kleinjung/Bahr/CWI
4703	C227	2,751-	CWI/Dodson/Franke/AKL/Leyland

Special number field sieve by SNFS difficulty:
4757	C244	2,809-	Franke/Kleinjung/Bahr/CWI
4703	C227	2,751-	CWI/Dodson/Franke/AKL/Leyland

General number field sieve by size of number factored:
4701	C158	2,953+	F. Bahr + J. Franke + T. Kleinjung
4559	C142	2,779-	B. Dodson + CWI + A. K. Lenstra + Edick + P. Leyland

Elliptic curve method:
4830	P57	2,997-	B. Dodson ECMNET
4253	P53	2,677-	C. Curry ECMNET
4827	P52	2,773-	P. Johansson ECMNET

Largest penultimate prime factor (ultimate factor shown also):
4677	p98*p128  2,727-    Dodson/AKL/CWI
4342	p93*p118  10,211-   The Cabal

	First five holes in each table on June 25, 2003

2,713-	c171	2,731-	c183	2,739-	c168	2,743-	c151	2,757-	c213
2,653+	c154	2,659+	c188	2,661+	c148	2,667+	c161	2,671+	c165
2,1238L	c160	2,1238M	c145	2,1262L	c177	2,1262M	c178	2,1294L	c187
2,716+	c163	2,736+	c172	2,760+	c153	2,764+	c220	2,772+	c215

3,431-	c198	3,437-	c151	3,443-	c187	3,449-	c175	3,451-	c167
3,409+	c161	3,412+	c195	3,419+	c173	3,424+	c156	3,436+	c194

5,307-	c187	5,311-	c173	5,313-	c210	5,317-	c194	5,319-	c182
5,302+	c187	5,304+	c172	5,307+	c159	5,311+	c203	5,313+	c197

6,263-	c196	6,277-	c139	6,281-	c162	6,283-	c173	6,293-	c214
6,251+	c179	6,257+	c200	6,263+	c186	6,268+	c138	6,269+	c135

7,253-	c177	7,257-	c192	7,259-	c175	7,263-	c161	7,269-	c224
7,232+	c171	7,233+	c150	7,239+	c176	7,253+	c164	7,254+	c178

10,223-	c211	10,227-	c212	10,233-	c162	10,239-	c228	10,241-	c229
10,223+	c201	10,226+	c197	10,229+	c164	10,232+	c205	10,236+	c193

11,199-	c173	11,217-	c171	11,221-	c135	11,227-	c195	11,229-	c217
11,206+	c213	11,208+	c185	11,212+	c201	11,218+	c192	11,220+	c147

12,193-	c199	12,199-	c146	12,215-	c182	12,227-	c197	12,229-	c242
12,202+	c216	12,206+	c192	12,208+	c202	12,209+	c185	12,214+	c189