is 2 1816729 - 1
has 546890 decimal digits
takes 0.099 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L355D4DD8C3B62E08double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.355768.6567%2780000917600000.60008.1234%16.955871.2029%2.5461%
PrimeNet2570.010663.1579%80001500000.00122.8752%0.011864.2172%1.0593%
GPU722610.169165.5738%90001300000.00121.5573%0.170366.1099%0.5361%
Difference+6+16.1866+3.0829%+2771000+91630000+0.5988+6.5661%+16.7854+5.0930%+5.0930%

Known prime factors (1 factor, 77.0 bits, 0.00423732% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18167291491049036396511806115292476.98141036638827158916
22 × 3 × 17 × 3359 × 59886869381
2017-11-2233595988686938116,038256.66479.37

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:50:00Carsten Kossendeyleela1000001650000---0.015--2.480%
2014-05-13T21:11:00Jocelyn LaroucheManual testing135330135330---0.011--1.060%
2014-09-22T21:00:00Jocelyn LaroucheManual testing170660170660---0.013--1.200%
2015-05-25T23:28:00mikrMSI278000091760000---0.600--8.123%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.063--
2010-04-18T13:21:00Architects Cubeda3_bu2260261--0.085--
2016-02-23T16:28:53Mark RoseManual testing261262--0.169--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.879--
2016-02-23T16:28:53Mark RoseManual testing262263--0.540--
2015-04-24T00:11:00snme2pm1Manual testing263264--1.081--
2015-04-24T00:11:00snme2pm1Manual testing264265--2.057--
2015-09-02T13:37:00ramgeisManual testing265266--4.113--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.322 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.322 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024817.12
50000500000030.207


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers355D4DD8C3B62E080.099
2015-07-10T01:00:00MadPooManual testing355D4DD8C3B62E080.099


PRP results:
dateuseridcompidcofactorsres64PRP
2017-11-23T21:03:09Oliver KruseGTX-3
149104903639651180611529
035E7B4033722C__no
2017-11-23T21:15:54ATHec2-1xf
149104903639651180611529
035E7B4033722C__no


P-1 factor-bounds graph:
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 170660 (P-1 stage 1)
B1 = 135330 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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265
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Last modified: 2021-03-05T18:09:53+00:00