List of champions for factoring Cunningham numbers: Continued fraction method: 1692 C63 5,171+ K. McCurdy & M. C. Wunderlich on the MPP 1602 C62 3,204+ J. W. Smith & S. S. Wagstaff, Jr. on the EPOC SPAR: 1066 C60 3,131+ A. O. L. Atkin & N. W. Rickert on a large IBM 941 C59 12,59- A. O. L. Atkin & N. W. Rickert on a large IBM Pollard p-1: 5267 P58 2,2098M P. Zimmermann 4871 P57 6,396+ P. Zimmermann p-1/FFT: 2590 P28 2, 733+ R. Silverman on an Alliant 2550 P27 2,1008+ R. Silverman on an Alliant p+1: 0 P21 2,439- R. P. Brent on a Univac 1100/82 5 P20 2,509- R. P. Brent on a Univac 1100/82 Brent-Pollard rho: 1343 P19 2,2386L H. Dubner on a special processor 1254 P19 2,1049- H. Dubner on a special processor Quadratic sieve method: 4682 C135 2,1606L Dodson, A.K. Lenstra, Leyland, Muffett, Wagstaff 4564 C124 2,895- Jens Franke Hybrid Special/General number field sieve by size of number factored: 4083 C123 2,1155+ CWI 4036 C121 2,1650L CWI Special number field sieve by size of number factored: 6132 C320 2,1061- NFS@Home 5501 C307 2,1039- K.Aoki+J.Franke+T.Kleinjung+A.K.Lenstra+D.A.Osvik Special number field sieve by SNFS difficulty: 6132 C320 2,1061- NFS@Home 6174 C218 2,1049+ NFS@Home 5501 C307 2,1039- K.Aoki+J.Franke+T.Kleinjung+A.K.Lenstra+D.A.Osvik General number field sieve by size of number factored: 6084 C197 7,374+ mersenneforum+Dodson+Womack 6054 C197 2,1196+ J.Bos+T.Kleinjung Elliptic curve method: 6135 P79 11,306+ S.Wagstaff 6131 P75 11,304+ S.Wagstaff Largest penultimate prime factor (ultimate factor shown also): 6132 p143*p177 2,1061- NFS@Home 6116 p133*p139 5,433+ NFS@Home First five holes in each table on June 14, 2013 2,947- c217 2,991- c264 2,1009- c204 2,1051- c248 2,1067- c260 2,947+ c212 2,961+ c221 2,983+ c236 2,989+ c249 2,991+ c224 2,1874L c195 2,1894M c227 2,1898L c219 2,1898M c257 2,1906M c274 2,1028+ c241 2,1052+ c300 2,1072+ c271 2,1076+ c238 2,1084+ c318 3,589- c213 3,593- c214 3,617- c277 3,619- c207 3,653- c289 3,589+ c212 3,592+ c220 3,596+ c243 3,599+ c269 3,604+ c248 5,419- c224 5,431- c266 5,449- c271 5,469- c210 5,473- c268 5,401+ c236 5,409+ c271 5,419+ c236 5,421+ c250 5,422+ c235 6,383- c264 6,391- c274 6,401- c274 6,407- c241 6,421- c281 6,362+ c241 6,376+ c224 6,389+ c242 6,391+ c260 6,394+ c273 7,337- c213 7,353- c263 7,359- c224 7,361- c290 7,367- c252 7,332+ c199 7,334+ c205 7,337+ c237 7,346+ c251 7,353+ c241 10,281- c210 10,283- c211 10,323- c271 10,337- c268 10,341- c226 10,281+ c242 10,284+ c200 10,289+ c217 10,292+ c198 10,298+ c267 11,269- c233 11,271- c221 11,283- c268 11,293- c300 11,299- c212 11,269+ c202 11,272+ c201 11,278+ c211 11,283+ c258 11,292+ c259 12,269- c205 12,271- c234 12,277- c285 12,281- c235 12,283- c244 12,271+ c250 12,274+ c213 12,283+ c194 12,284+ c252 12,289+ c265