is 2 1738207 - 1
has 523253 decimal digits
takes 0.094 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDF373D03682F4ED1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26834.291069.1176%17382071912027700.94877.9770%35.239771.5811%2.4635%
PrimeNet2570.011063.1579%80001400000.00122.7989%0.012264.1891%1.0312%
GPU722610.176765.5738%80001100000.00111.4107%0.177866.0594%0.4856%
Difference+7+34.1143+3.5439%+1730207+191092770+0.9477+6.5663%+35.0620+5.5217%+5.5217%

Known prime factors (1 factor, 81.9 bits, 0.00470889% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
173820743590115427829611077786632581.8501253881598331775533
3 × 599 × 697763827674889
2019-11-22599697763827674889331,3262,990,4415,585,312

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T05:49:00Carsten Kossendeyleela950001543750---0.014--2.125%
2014-04-05T13:21:00Jocelyn LaroucheManual testing100000100000---0.008--0.768%
2014-05-06T10:52:00Jocelyn LaroucheManual testing136926136926---0.011--0.923%
2014-09-11T21:44:00Jocelyn LaroucheManual testing173852173852---0.014--1.053%
2014-12-02T21:55:00Jocelyn LaroucheManual testing210778210778---0.017--1.165%
2015-04-09T15:29:00mikrMSI247540086660000---0.556--7.314%
2018-08-09T11:43:50Jocelyn Larouchelow 4M173820717382070012---0.874--7.870%
2018-10-17T22:59:58Jocelyn Larouchelow 4M173820719120277012---0.949--7.977%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:49Mark RoseManual testing258260--0.066--
2010-04-24T12:42:00Architects Cubedm1_f2260261--0.088--
2016-02-23T16:28:49Mark RoseManual testing261262--0.177--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.918--
2016-02-23T16:28:49Mark RoseManual testing262263--0.565--
2015-05-06T02:36:00snme2pm1Manual testing263264--1.130--
2015-05-06T02:36:00snme2pm1Manual testing264265--2.150--
2015-09-04T17:59:00ramgeisManual testing265266--4.299--
2018-03-12T16:50:49TJAOIManual testing266267--8.598--
2019-06-17T12:15:05TJAOIManual testing267268--17.20--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.239 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.239 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024817.03
50000500000030.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00edoderoov4_computersDF373D03682F4ED10.094
2003-01-25T00:00:00edoderoov4_computersDF373D03682F4ED10.094
2015-07-18T19:04:00MadPooManual testingDF373D03682F4ED10.094


PRP results:
dateuseridcompidcofactorsres64PRP
2019-11-23T04:17:30mnd927016b
4359011542782961107778663
ADB66DC627179BBCno
2019-11-26T19:42:46Chang Chia-Tcheexbpc13
4359011542782961107778663
ADB66DC627179BBCno


P-1 factor-bounds graph:
B1 = 1738207, B2 = 191202770 (P-1 stage 2)
B1 = 1738207, B2 = 173820700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1738207 (P-1 stage 1)
B1 = 210778 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 173852 (P-1 stage 1)
B1 = 136926 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-06-08T08:22:29+00:00