is 2 7802387 - 1
has 2348753 decimal digits
takes 1.785 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L874CF4CDF050ACE8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2687.639366.1765 %24000062400000.18814.2221 %7.827467.6045 %
Target2673.808365.6716 %5000055000000.11512.4530 %3.923466.5137 %
Difference+1+3.8310+0.5048 %+190000+740000+0.0730+1.7691%+3.9040+1.0908 %

Known prime factors (1 factor, 80.8 bits, 0.00103521% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
780238720626560803655013814059372580.771132181092809514664
23 × 16522636601189333
2018-07-2981652263660118933331,384298,675,342557,842,363

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-05-11ANONYMOUSv4_computers40000420000--0.0201.811%
2012-10-01NesowaWork9000015300006--0.0562.977%
2016-09-09Squeeky_Squirreli5-5250U_1600240000624000012--0.1884.679%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-09ANONYMOUSv4_computers212610.020
1998-08-16ANONYMOUSv4_computers212620.039
1999-05-09jingfiredv4_computers212630.126
1999-07-04ANONYMOUSv4_computers212630.126
2012-07-21Squeeky_SquirrelP4_26002632640.252
2013-12-17David CampeauManual testing2642650.479
2015-06-09VictordeHollanderManual testing2652660.958
2016-08-23Gordon SpenceManual testing2662671.916
2018-08-05ramgeisManual testing267268


ECM factoring results:
Total ECM effort:2.088 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.044
50000500000031.044


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-26ANONYMOUSv4_computers874CF4CDF050ACE81.785
2002-07-06ANONYMOUSv4_computers874CF4CDF050ACE81.785


PRP results:
dateuseridcompidcofactorsres64
2018-08-01Oliver KruseGTX-6
2062656080365501381405937
B3A73E19E08D96EA
2019-10-08marssystemssystem11
2062656080365501381405937
B3A73E19E08D96EA


CERT results:
No CERT results for M7802387


P-1 factor-bounds graph:
B1 = 240000, B2 = 6240000 (P-1 stage 2)
B1 = 240000 (P-1 stage 1)
B1 = 90000, B2 = 1530000 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
B1 = 40000, B2 = 420000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-02-09T03:30:02+00:00