is 2 1953811 - 1
has 588156 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB96A81413F6628C1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26830.507069.1176 %19538112442263751.19208.4450 %31.699071.7257 %
Target2620.314466.1290 %80004500000.00251.1536 %0.317066.5198 %
Difference+6+30.1925+2.9886 %+1945811+243776375+1.1895+7.2915%+31.3820+5.2059 %

Known prime factors (1 factor, 86.6 bits, 0.00443489% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19538111213576424814253899933274312786.64931056648386518806065
5 × 7 × 19 × 46701726897020761
2020-02-2419467017268970207618,020,976200,151,926373,828,059

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-12-22ANONYMOUSv4_computers25000387500--0.0042.451%
2011-05-16kurlyhex10000003000000012--0.2039.639%
2018-01-22JossManual testing19538116000000012--0.40211.141%
2018-03-03JossManual testing195381112000000012--0.66012.245%
2018-05-11JossManual testing195381119538110012--0.98313.015%
2018-11-26JossManual testing195381124422637512--1.19213.365%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-21ANONYMOUSv4_computers212580.020
2016-02-23Mark RoseManual testing2582600.059
2010-01-16S485122USB-W2602610.079
2016-02-23Mark RoseManual testing2612620.157
2011-08-27GrunwalderGIMPManual testing212630.817
2016-02-23Mark RoseManual testing2622630.502
2015-04-22lycornManual testing2632641.005
2015-04-22lycornManual testing2642651.912
2015-09-07ramgeisManual testing2652663.825
2018-02-05TJAOIManual testing2662677.649
2019-05-13chuenkitManual testing26726815.30


ECM factoring results:
Total ECM effort:19.671 GHz-days
Estimated T-Level:24.791
DigitsB1CompleteFacMiss
201100010.1830.004%
25500000.95838.357%
302500000.06194.087%
3510000000.00399.714%


ECM Summary

B1B2factorcurvesGHz-days
500005000000835.668
50000500000030.209
50000750000016513.79


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10ANONYMOUSv4_computersB96A81413F6628C10.106
2015-07-12MadPooManual testingB96A81413F6628C10.106


PRP results:
dateuseridcompidcofactorsres64
2020-02-25Niels_Mache_NextcloudSuperDry-X
121357642481425389993327431
A71D91C2A64A17CD
2020-02-27arnaudstm-11-010
121357642481425389993327431
A71D91C2A64A17CD


CERT results:
No CERT results for M1953811


P-1 factor-bounds graph:
B1 = 1953811, B2 = 244226375 (P-1 stage 2)
B1 = 1953811, B2 = 195381100 (P-1 stage 2)
B1 = 1953811, B2 = 120000000 (P-1 stage 2)
B1 = 1953811, B2 = 60000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1953811 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 25000, B2 = 387500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=24.79 ~= 66-bit
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Last modified: 2024-02-29T14:28:04+00:00