is 2 3063817 - 1
has 922301 decimal digits
takes 0.261 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L8F4AAB3FD071E5A5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26938.966768.1159 %30000001000000001.02247.4094 %39.989170.4784 %
Target2641.161765.6250 %1400011000000.00901.4662 %1.170866.1290 %
Difference+5+37.8050+2.4909 %+2986000+98900000+1.0134+5.9431%+38.8184+4.3493 %

Known prime factors (1 factor, 81.8 bits, 0.00266988% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
306381742102135440748108762964312581.800687086327948896895
5 × 1453 × 94574855877343
2021-05-09145394574855877343181,814635,9001,187,685

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2004-02-07ANONYMOUSv4_computers2048204800--0.0020.572%
2010-09-24markrtiny11000024475006--0.0294.199%
2016-03-05Squeeky_SquirrelP4_260019500054112506--0.0595.341%
2017-12-05mikrMSI300000010000000012--1.02210.976%
2022-02-11JossManual testing1000000119912100--1.13910.428%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-06-17David Campeauv4_computers212600.025
2009-02-13Sturle Sundescarpia.ifi2602610.050
2011-10-11Sid & AndyBuzz2612620.100
2013-01-07dbaughManual testing2622630.320
2015-02-07VictordeHollanderManual testing2632651.860
2015-06-06ThaManual testing2652662.439
2017-05-09Gordon SpenceManual testing2662674.878
2018-08-01ramgeisManual testing2672689.76
2022-01-20JossManual testing267268
2021-03-30TJAOIManual testing26826919.51


ECM factoring results:
Total ECM effort:6.653 GHz-days
Estimated T-Level:21.032
DigitsB1CompleteFacMiss
20110002.23110.745%
25500000.20681.350%
302500000.01398.707%


ECM Summary

B1B2factorcurvesGHz-days
500005000000576.537
50000500000010.117


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-30ANONYMOUSv4_computers8F4AAB3FD071E5A50.261


PRP results:
dateuseridcompidcofactorsres64
2021-07-09LaurVbutu
4210213544074810876296431
9C779B62FF8A903F


CERT results:
dateuseridcompid
2021-07-09ky0urakudb1-2


P-1 factor-bounds graph:
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 1000000, B2 = 119912100 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 195000, B2 = 5411250 (P-1 stage 2)
B1 = 110000, B2 = 2447500 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
B1 = 110000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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102
103
104
105
106
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109
1010
1011
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1013
1014
TF factor-bounds graph:
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268
267
266
265
263
262
261
260
this exponent TF target: 64
TF double-checked to: 67
ECM T-Level=21.03 ~= 53-bit
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Last modified: 2024-03-13T02:15:48+00:00