is 2 1883551 - 1
has 567006 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L3B5CD525EC0D2F89double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26831.644969.1176 %21499082354438751.16908.4476 %32.813971.7265 %
Target2610.163165.5738 %100007500000.00401.6921 %0.167066.1563 %
Difference+7+31.4819+3.5439 %+2139908+234693875+1.1650+6.7555%+32.6469+5.5702 %

Known prime factors (1 factor, 69.8 bits, 0.00370633% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188355110353065439528192565192269.811274828381061309
31 × 613 × 14462368103
2020-10-286131446236810363.38461.982115.77

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2012-01-15markrtiny275000600000012--0.0467.187%
2015-10-07Bruno Victal5820K.ECM5000001500000012--0.1018.892%
2016-09-16JossManual testing5000003000000012--0.1669.901%
2016-12-23JossManual testing720000720000---4.469%
2016-12-27JossManual testing864000864000---4.741%
2017-01-21JossManual testing10368001036800---5.021%
2017-03-01JossManual testing12441601244160012---9.131%
2017-05-06JossManual testing14929921492992012---9.510%
2017-05-13JossManual testing17915901791590012---9.892%
2017-05-28JossManual testing21499083869834412--0.32611.289%
2018-02-17JossManual testing21499087739668812--0.49212.467%
2018-03-18JossManual testing214990821499080012--1.08114.172%
2018-11-26JossManual testing214990823544387512--1.16914.322%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-09ANONYMOUSv4_computers212580.020
2016-02-23Mark RoseManual testing2582600.061
2010-04-02Architects CubedManual testing2602610.082
2016-02-23Mark RoseManual testing2612620.163
2011-03-08GrunwalderGIMPManual testing212630.847
2016-02-23Mark RoseManual testing2622630.521
2015-05-09snme2pm1Manual testing2632641.042
2015-05-09snme2pm1Manual testing2642651.984
2015-09-13ramgeisManual testing2652663.967
2018-05-28TJAOIManual testing2662677.935
2019-06-24TJAOIManual testing26726815.87


ECM factoring results:
Total ECM effort:39.056 GHz-days
Estimated T-Level:25.717
DigitsB1CompleteFacMiss
201100014.8130.000%
25500001.68118.620%
302500000.14386.642%
3510000000.01099.012%


ECM Summary

B1B2factorcurvesGHz-days
50000500000016411.26
50000500000060.416
500006600000816.331
250000400000004921.05


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13ANONYMOUSv4_computers3B5CD525EC0D2F890.102
2015-06-27MadPooManual testing3B5CD525EC0D2F890.102


PRP results:
dateuseridcompidcofactorsres64
2020-10-31laxeye
1035306543952819256519
B070172F99DCC8AC


CERT results:
dateuseridcompid
2020-10-31Ben Deloi-0d174ebe8b622c15b


P-1 factor-bounds graph:
B1 = 2149908, B2 = 235443875 (P-1 stage 2)
B1 = 2149908, B2 = 214990800 (P-1 stage 2)
B1 = 2149908, B2 = 77396688 (P-1 stage 2)
B1 = 2149908, B2 = 38698344 (P-1 stage 2)
B1 = 1791590, B2 = 17915900 (P-1 stage 2)
B1 = 1492992, B2 = 14929920 (P-1 stage 2)
B1 = 2149908 (P-1 stage 1)
B1 = 500000, B2 = 30000000 (P-1 stage 2)
B1 = 1244160, B2 = 12441600 (P-1 stage 2)
B1 = 1791590 (P-1 stage 1)
B1 = 1492992 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1244160 (P-1 stage 1)
B1 = 1036800 (P-1 stage 1)
B1 = 864000 (P-1 stage 1)
B1 = 720000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
250
260
270
JSON version of this page
Last modified: 2024-02-29T14:28:04+00:00