is 2 1837709 - 1
has 553206 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF3FE90F66CDB5636double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.169068.6567%2780000917600000.60008.1327%16.769071.2058%2.5490%
PrimeNet2570.010463.1579%80001500000.00122.8814%0.011764.2195%1.0616%
GPU722610.167265.5738%90001400000.00131.5960%0.168466.1232%0.5494%
Difference+6+16.0018+3.0829%+2771000+91620000+0.5988+6.5367%+16.6006+5.0826%+5.0826%

Known prime factors (3 factors, 240.7 bits, 0.01309731% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18377092100296437952420385605032477.47557144423789414439
17 × 89 × 157 × 1093 × 220097503
2021-04-23109322009750327,5400.94341.7618
183770920623326781076283339138172580.771561115137953731612
22 × 19 × 7383093920443837
2021-04-23197383093920443837169,35531,642,09559,098,621
183770965827393473357899397637192582.4451791017878057894351
194479 × 9209312460769
2016-09-081944799209312460769854,96439,46973,717

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
183770943315099777023273767685576996285935148274216995148158.245
1837709138257040031786002005931402035966640462670579065749159.920
18377091357579846747548110026104747712877104523548940542350163.216
183770928513201163598680551028290820448937585258068592728
43295852622290281807769
73240.690
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T05:49:00Carsten Kossendeyleela1000001675000---0.015--2.493%
2014-05-19T21:00:00Jocelyn LaroucheManual testing134926134926---0.011--1.061%
2014-09-22T21:00:00Jocelyn LaroucheManual testing169852169852---0.013--1.200%
2015-07-03T09:57:00mikrMSI278000091760000---0.600--8.133%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2016-02-23T16:28:54Mark RoseManual testing258260--0.063--
2010-04-16T14:26:00Architects Cubeda3_lm260261--0.084--
2016-02-23T16:28:54Mark RoseManual testing261262--0.167--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.868--
2016-02-23T16:28:54Mark RoseManual testing262263--0.534--
2015-04-26T21:13:00snme2pm1Manual testing263264--1.068--
2015-04-26T21:13:00snme2pm1Manual testing264265--2.033--
2015-09-05T13:49:00ramgeisManual testing265266--4.066--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.238 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.238 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5750.019%
25500000.77745.986%
302500000.04895.308%
3510000000.00299.779%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.280
50000500000030.207
5000066000001088.414
50000660000070.545
5000066000001007.791


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10T00:00:00ANONYMOUSv4_computersF3FE90F66CDB56360.100
2015-07-10T01:00:00MadPooManual testingF3FE90F66CDB56360.100


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T03:29:14Oliver KruseGTX-2
6582739347335789939763719
9F3BB3D869A1D3__no
2017-11-06T10:38:21kkmrkkblmbrbkc4.xlarge
6582739347335789939763719
9F3BB3D869A1D3__no
2021-04-23T12:52:34ATHec2-PRPCFDC
210029643795242038560503
2062332678107628333913817
6582739347335789939763719
E76FDE7E265D456Fno


P-1 factor-bounds graph:
B1 = 2780000, B2 = 91760000 (P-1 stage 2)
B1 = 2780000 (P-1 stage 1)
B1 = 100000, B2 = 1675000 (P-1 stage 2)
B1 = 169852 (P-1 stage 1)
B1 = 134926 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2021-04-23T12:52:34+00:00