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:
6319	C221	3,697+	NFS@Home
6393	C218	2,1285-	NFS@Home
6269	C216	3,766+	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):
6537	p147*p156 12,293+   NFS@Home
6302	p146*p156 2,1109-   J.Bos+T.Kleinjung+A.K.Lenstra

	First five holes in each table on December 17, 2021

2,1207-	c337	2,1213-	c297	2,1217-	c248	2,1229-	c284	2,1231-	c329
2,1091+	c307	2,1097+	c288	2,1109+	c225	2,1123+	c338	2,1129+	c330
2,2194L	c304	2,2194M	c301	2,2206L	c243	2,2222L	c228	2,2222M	c289
2,1108+	c271	2,1124+	c311	2,1136+	c247	2,1168+	c326	2,1180+	c249

3,677-	c259	3,691-	c265	3,703-	c269	3,715-	c211	3,725-	c217
3,674+	c247	3,683+	c256	3,692+	c277	3,701+	c302	3,709+	c327

5,503-	c260	5,509-	c271	5,521-	c364	5,529-	c281	5,533-	c336
5,461+	c291	5,463+	c249	5,464+	c223	5,467+	c230	5,472+	c317

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

7,379-	c320	7,383-	c274	7,389-	c299	7,395-	c220	7,419-	c281
7,386+	c245	7,388+	c314	7,395+	c221	7,397+	c300	7,398+	c332

10,323-	c271	10,353-	c328	10,365-	c288	10,377-	c311	10,383-	c230
10,323+	c242	10,332+	c295	10,346+	c300	10,347+	c318	10,353+	c300

11,311-	c251	11,313-	c273	11,317-	c319	11,323-	c241	11,331-	c344
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
12,298+	c305	12,307+	c304	12,326+	c347	12,328+	c301	12,331+	c241