is 2 2517587 - 1
has 757870 decimal digits
takes 0.175 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ecm on 2022-12-12, 0.0% done, ETC
factored, 0 LL tests remaining
ResidueStatus
L-LBA02138BD797D960double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27094.912668.5714%5000000893688411049.445412.2390%144.357972.4180%3.8465%
Target2630.633965.0794%110001700000.00201.4095%0.635965.5716%0.4922%
Difference+7+94.2786+3.4921%+4989000+8936714110+49.4434+10.8295%+143.7220+6.8464%+3.3543%

Known prime factors (1 factor, 126.5 bits, 0.00502320% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
251758711729557255681734649632227272487960683939126.46323295237176871612876997353562137
32 × 71 × 419 × 130657 × 1727911 × 1826899 × 210952009
2023-01-2318268992109520096.124e+101.32962.1589

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.152%
2003-10-31T00:00:00Team Prime Ribv4_computers15000236250---0.003--0.579%
2010-12-19T21:41:00Jocelyn LaroucheManual testing2000020000---0.002--0.185%
2011-01-01T13:19:00Jocelyn LaroucheManual testing3000030000---0.003--0.262%
2011-01-06T01:06:00Jocelyn LaroucheManual testing5000050000---0.005--0.387%
2011-03-04T07:33:00James Heinrichi7-9203000008000000---0.072--3.208%
2017-11-01T21:31:23Jocelyn Larouchelow 4M60000060000006---0.090--3.307%
2018-04-25T06:53:46mikrMSI300000013500000012---1.025--7.013%
2023-01-23T09:35:45Architects Cubedgpu72ng5000000893688411039126.46349.450.34998.8912.239%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-03-09T00:00:00Denis Clavev4_computers21258--0.015--
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-30T23:35:00Sturle Sundegigotte.ifi260261--0.061--
2012-06-13T11:43:00Sebastian HornbostelManual testing261262--0.122--
2013-01-23T08:30:00dbaughManual testing262263--0.390--
2015-02-18T11:36:00VictordeHollanderManual testing263264--0.780--
2015-02-18T11:36:00VictordeHollanderManual testing264265--1.484--
2015-11-06T09:16:18ramgeisManual testing265266--2.968--
2017-07-31T22:29:10Gordon SpenceManual testing266267--5.936--
2019-04-29T13:20:23TJAOIManual testing267268--11.87--
2021-05-27T10:39:08TJAOIManual testing268269--23.75--
2022-12-18T03:50:02Architects CubedGPU72_TF269270--47.49--


ECM factoring results:
Total ECM effort:15.565 GHz-days
Estimated T-Level:23.000
DigitsB1CompleteFacMiss
20110006.4840.153%
25500000.60054.878%
302500000.03896.284%
3510000000.00299.823%


ECM Summary

B1B2factorcurvesGHz-days
50000500000015414.17
50000515000070.652
50000675000070.740


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-03-09T00:00:00Denis Clavev4_computersBA02138BD797D9600.175
1999-04-13T00:00:00ANONYMOUSv4_computersBA02138BD797D9600.175
2018-06-05T10:32:22kkmrkkblmbrbkoldBA02138BD797D9600.175


PRP results:
dateuseridcompidcofactorsres64PRP
2023-01-24T19:09:39LordJuliusWhiteBox
117295572556817346496322272724879606839
71868BF6CCF3DD9Cno


P-1 factor-bounds graph:
B1 = 5000000, B2 = 8936884110 (P-1 stage 2)
B1 = 3000000, B2 = 135000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 3000000 (P-1 stage 1)
B1 = 600000, B2 = 6000000 (P-1 stage 2)
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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102
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1010
TF factor-bounds graph:
270
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267
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Last modified: 2023-01-24T19:09:39+00:00