is 2 1884907 - 1
has 567414 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L012F34B98A5BA97Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.764168.6567%500000150000000.10155.0867%15.865670.2510%1.5943%
PrimeNet2570.010263.1579%90001600000.00143.0335%0.011564.2755%1.1176%
GPU722610.163065.5738%100001500000.00141.6923%0.164466.1564%0.5826%
Difference+6+15.6012+3.0829%+490000+14850000+0.1001+3.3943%+15.7012+4.0947%+4.0947%

Known prime factors (1 factor, 89.1 bits, 0.00472688% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18849076621573589707964529598365932789.097175647222640373358728
23 × 7 × 3136557547149524263
2016-07-1183136557547149524263125,367,8771.344e+102.511e+10

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-16T12:10:00markrtiny2750006000000---0.046--3.932%
2015-10-07T19:11:55Bruno Victal5820K-linux5000001500000012---0.101--5.087%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:56Mark RoseManual testing258260--0.061--
2010-04-01T14:42:00Architects CubedManual testing260261--0.081--
2016-02-23T16:28:56Mark RoseManual testing261262--0.163--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.847--
2016-02-23T16:28:56Mark RoseManual testing262263--0.521--
2015-05-09T22:18:00snme2pm1Manual testing263264--1.042--
2015-05-09T22:18:00snme2pm1Manual testing264265--1.982--
2015-09-13T19:11:00ramgeisManual testing265266--3.965--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.813 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.813 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8080.015%
25500000.79845.029%
302500000.04995.184%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000372.564
50000500000030.208
50000660000021817.04


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers012F34B98A5BA97B0.102
2015-07-06T20:15:00MadPooManual testing012F34B98A5BA97B0.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T14:45:24Oliver KruseGTX-0
662157358970796452959836593
8B47F60FECBB40__no
2017-11-08T17:57:15kkmrkkblmbrbkold
662157358970796452959836593
8B47F60FECBB40__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-20T13:19:05+00:00