is 2 1296679 - 1
has 390340 decimal digits
takes 0.041 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L44CEF674B5DDC32Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26722.915468.6567 %1190000345100000.13816.2108 %23.053570.6034 %
Target2600.118465.0000 %55001800000.00070.9344 %0.119165.3270 %
Difference+7+22.7970+3.6567 %+1184500+34330000+0.1374+5.2764%+22.9344+5.2763 %

Known prime factors (1 factor, 75.9 bits, 0.00585021% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1296679684940432793426415083692375.85826411333598887096
23 × 3301416699860887
2015-07-10833014166998608875,901.28,266,28915,439,126

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-02-27ANONYMOUSv4_computers204820480012--0.0011.003%
2013-11-13David Campeaui5-2500k11900003451000012--0.13811.247%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-10-27ANONYMOUSv4_computers212570.015
2003-06-17ANONYMOUSv4_computers212580.030
2022-03-07LordJuliusManual testing258260
2009-02-15Sturle Sundegorro.ifi2602610.118
2011-05-09XyzzyManual testing2612620.237
2013-01-03dbaughManual testing2622630.757
2015-04-25omylistManual testing2632641.514
2015-04-25monstManual testing2642652.881


ECM factoring results:
Total ECM effort:20.650 GHz-days
Estimated T-Level:25.704
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002489.438
50000500000030.116
250000350000005011.10


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-09-14ANONYMOUSv4_computers44CEF674B5DDC32B0.041


PRP results:
dateuseridcompidcofactorsres64
2017-09-30Oliver KruseGTX-3
68494043279342641508369
2D82CEF6178E7772
2017-10-22kkmrkkblmbrbkc4.xlarge
68494043279342641508369
2D82CEF6178E7772


CERT results:
No CERT results for M1296679


P-1 factor-bounds graph:
B1 = 1190000, B2 = 34510000 (P-1 stage 2)
B1 = 1190000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
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Last modified: 2024-02-09T03:30:02+00:00