is 2 1271503 - 1
has 382761 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF9C7E6938D9B220Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26846.877569.1176%1000000005121333426301,286.656121.7076%1,333.533675.8215%6.7038%
Target2600.120865.0000%5500360000.00030.9302%0.121165.3256%0.3256%
Difference+8+46.7567+4.1176%+99994500+512133306630+1,286.6557+20.7774%+1,333.4124+10.4959%+6.3782%

Known prime factors (1 factor, 126.0 bits, 0.00991211% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12715038702212605257970423424267437736982701738126.03334220181176363604424937524479836
22 × 359 × 607 × 1447 × 345517 × 349813 × 224473602889
2022-11-253498132244736028891.088e+11562.071,049.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.193%
2013-10-01T08:02:00David Campeaui5-2500k119500034655000---0.139--5.671%
2016-08-03T23:51:58Bruno Victal5820K-factoring25000006250000012---0.265--6.716%
2016-08-27T10:53:02Bruno VictalManual testing25000006250000012---0.265--6.716%
2018-05-03T11:47:06Jocelyn Larouchelow 4M127150312715030012---0.374--7.047%
2018-10-13T20:38:16Jocelyn Larouchelow 4M127150313986533012---0.405--7.147%
2022-01-09T06:41:00onlinegameManual testing100000000200000000---4.846--9.365%
2022-11-25T17:35:09Sid & AndyRocky10000000051213334263038126.0331,2870.0812,57321.708%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-27T00:00:00ANONYMOUSv4_computers21256--0.008--
2001-11-10T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-06T00:00:00ANONYMOUSv4_computers21258--0.030--
2003-06-17T00:00:00ANONYMOUSv4_computers21258--0.030--
2016-02-23T16:28:26Mark RoseManual testing258260--0.091--
2009-02-15T05:25:00Sturle Sundeeames.ifi260261--0.121--
2012-09-14T05:54:00AxelssonManual testing261262--0.242--
2012-10-18T21:47:00dbaughManual testing262263--0.772--
2015-04-09T03:31:00omylistManual testing263264--1.544--
2015-04-10T17:49:00monstManual testing264265--2.939--
2015-09-24T15:27:45ramgeisManual testing265266--5.877--
2018-09-12T17:28:15YxinityManual testing266267--11.75--
2020-03-11T18:17:13Gordon SpenceManual testing267268--23.51--


ECM factoring results:
Total ECM effort:19.378 GHz-days
Estimated T-Level:25.674
DigitsB1CompleteFacMiss
201100014.3150.000%
25500001.60820.026%
302500000.13587.391%
3510000000.00999.079%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002549.77
25000025000000509.61


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-09-14T00:00:00ANONYMOUSv4_computersF9C7E6938D9B220E0.040
2016-06-01T18:50:28MadPooManual testingF9C7E6938D9B220E0.040


PRP results:
dateuseridcompidcofactorsres64PRP
2022-11-25T20:26:17Kevin_9611F
87022126052579704234242674377369827017
23A9B3871CF44A__no


P-1 factor-bounds graph:
B1 = 100000000, B2 = 512133342630 (P-1 stage 2)
B1 = 100000000, B2 = 200000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
B1 = 1271503, B2 = 139865330 (P-1 stage 2)
B1 = 1271503, B2 = 127150300 (P-1 stage 2)
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 1195000, B2 = 34655000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 1271503 (P-1 stage 1)
B1 = 1195000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-11-25T20:26:17+00:00