is 2 8787041 - 1
has 2645163 decimal digits
takes 2.294 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L09F2D8E955F02141double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2673.381664.1791%16500035475000.13224.0221%3.513865.6199%1.4407%
PrimeNet2640.405162.5000%3600010000000.03353.3141%0.438663.7428%1.2428%
GPU722686.783364.7059%5500012000000.04442.3007%6.827765.5179%0.8120%
Difference-1-3.4017-0.5268%+110000+2347500+0.0878+1.7214%-3.3139+0.1020%+0.1020%

Known prime factors (1 factor, 64.6 bits, 0.00073541% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8787041283606375463130384312064.6211613776329615
3 × 5 × 107585088641
2013-11-2051075850886410.76542,219.24,144.9

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-02T00:00:00Team Prime Ribv4_computers40000270000---0.020--1.617%
2012-06-30T21:13:00James Heinrichi7-9201650003547500---0.132--4.022%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21262--0.070--
1999-05-23T00:00:00ANONYMOUSv4_computers21263--0.182--
2000-08-17T00:00:00ANONYMOUSv4_computers21263--0.182--
1999-11-10T00:00:00ANONYMOUSv4_computers21264--0.405--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CurvesCompleteFacMiss

New Calculation Method

Total ECM effort:0.000 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-30T00:00:00ANONYMOUSv4_computers09F2D8E955F021412.294
2003-02-02T00:00:00Team Prime Ribv4_computers09F2D8E955F021412.294


PRP results:
dateuseridcompidcofactorsres64PRP
2019-01-26T02:44:25Luigi MorelliGoogleCloudTmp
28360637546313038431
F840BAF4B9D81D__no
2020-09-07T03:19:42Wentao Huanggimi1
28360637546313038431
F840BAF4B9D81DE4no


P-1 factor-bounds graph:
B1 = 165000, B2 = 3547500 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 40000, B2 = 270000 (P-1 stage 2)
B1 = 40000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-09-07T03:19:42+00:00