is 2 7905839 - 1
has 2379895 decimal digits
takes 1.809 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L4900EFB196BF1C32double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2687.539366.1765 %10000019250000.06622.8544 %7.605567.1419 %
Target2673.758565.6716 %5500060000000.12572.5620 %3.884266.5511 %
Difference+1+3.7809+0.5048 %+45000-4075000-0.0595+0.2925%+3.7213+0.5908 %

Known prime factors (1 factor, 74.8 bits, 0.00094636% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7905839332939797861896982912732374.8182105657589674524
22 × 173 × 12907 × 235752521
2018-10-0512907235752521483.934.26577.9595

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-06-02David Martinv4_computers4000040000--0.0130.673%
2012-06-15NesowaERA10000019250006--0.0663.204%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-09Mark Dv4_computers212610.019
1998-10-11ANONYMOUSv4_computers212620.039
1998-12-21ANONYMOUSv4_computers212630.124
2013-10-01NesowaManual testing2632640.248
2013-10-12David CampeauManual testing2642650.473
2015-06-03VictordeHollanderManual testing2652660.945
2016-08-14Gordon SpenceManual testing2662671.890
2018-07-24ramgeisManual testing2672683.781


ECM factoring results:
Total ECM effort:1.740 GHz-days
Estimated T-Level:0.962
DigitsB1CompleteFacMiss
20110000.19282.505%
25500000.01898.236%
302500000.00199.888%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.044
50000500000020.696


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-22ANONYMOUSv4_computers4900EFB196BF1C321.809
2002-07-20David Martinv4_computers4900EFB196BF1C321.809


PRP results:
dateuseridcompidcofactorsres64
2018-10-05ATHwork200558
33293979786189698291273
9FD656993EE3A855
2019-11-14marssystemssystem11
33293979786189698291273
9FD656993EE3A855


CERT results:
No CERT results for M7905839


P-1 factor-bounds graph:
B1 = 100000, B2 = 1925000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 40000 (P-1 stage 1)
103
104
105
103
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=0.96 ~= -13-bit
250
260
270
280
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Last modified: 2024-02-09T03:30:02+00:00