is 2 1810561 - 1
has 545034 decimal digits
takes 0.098 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L93C61F18A4279784double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26832.920769.1176%18105611810561000.91067.9800%33.831371.5821%2.4644%
PrimeNet2570.010663.1579%80001500000.00122.8733%0.011864.2165%1.0586%
GPU722610.169765.5738%90001300000.00121.5562%0.170966.1095%0.5357%
Difference+7+32.7510+3.5439%+1801561+180926100+0.9094+6.4238%+33.6604+5.4725%+5.4725%

Known prime factors (1 factor, 73.3 bits, 0.00405098% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1810561120004314164262286958172373.3463314009143140228
22 × 35 × 13 × 262267263623
2019-11-222432622672636231,794.71,124.02,099.3

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:43:00Carsten Kossendeyleela1000001650000---0.015--2.198%
2014-05-12T10:21:00Jocelyn LaroucheManual testing135450135450---0.011--0.924%
2014-09-20T22:31:00Jocelyn LaroucheManual testing170900170900---0.013--1.051%
2015-05-14T05:58:00mikrMSI278000091760000---0.600--7.482%
2018-09-20T11:55:03Jocelyn Larouchelow 4M181056118105610012---0.911--7.980%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:53Mark RoseManual testing258260--0.064--
2010-04-17T14:28:00Architects Cubeda3_bu2260261--0.085--
2016-02-23T16:28:53Mark RoseManual testing261262--0.170--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.882--
2016-02-23T16:28:53Mark RoseManual testing262263--0.542--
2015-04-22T10:38:00snme2pm1Manual testing263264--1.084--
2015-04-22T10:38:00snme2pm1Manual testing264265--2.064--
2015-09-01T08:49:00ramgeisManual testing265266--4.127--
2018-04-16T13:13:01TJAOIManual testing266267--8.255--
2019-07-17T09:51:53TJAOIManual testing267268--16.51--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.034 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.034 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5330.020%
25500000.77346.170%
302500000.04895.333%
3510000000.00299.781%


ECM Summary

B1B2factorcurvesGHz-days
500005000000543.725
50000500000010.069
50000660000019615.24


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers93C61F18A42797840.098
2015-07-06T20:16:00MadPooManual testing93C61F18A42797840.098


PRP results:
dateuseridcompidcofactorsres64PRP
2019-11-23T13:31:32Niels_Mache_NextcloudSuperDry-X
12000431416426228695817
4DBC947FBC1F14B8no
2019-11-24T10:25:41GANKA
12000431416426228695817
4DBC947FBC1F14B8no


P-1 factor-bounds graph:
B1 = 1810561, B2 = 181056100 (P-1 stage 2)
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 1810561 (P-1 stage 1)
B1 = 100000, B2 = 1650000 (P-1 stage 2)
B1 = 170900 (P-1 stage 1)
B1 = 135450 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-02-12T10:31:26+00:00