is 2 2627869 - 1
has 791068 decimal digits
takes 0.203 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9E22B5A13D812670double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26945.431068.1159%80000002500000002.37258.9789%47.803670.9788%2.8628%
PrimeNet2590.029262.7119%110002000000.00242.7002%0.031663.7187%1.0068%
GPU722630.607365.0794%130002000000.00261.5722%0.609965.6284%0.5490%
Difference+6+44.8237+3.0366%+7987000+249800000+2.3699+7.4068%+47.1936+5.3504%+5.3504%

Known prime factors:
No known factors for M2627869

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.192%
2003-11-08T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.668%
2010-12-21T22:27:00Jocelyn LaroucheManual testing2000020000---0.002--0.224%
2010-12-26T02:29:00Jocelyn LaroucheManual testing3000030000---0.003--0.312%
2011-01-20T22:46:00Jocelyn LaroucheManual testing5000050000---0.006--0.457%
2011-02-28T05:29:00James Heinrichi7-9203000008000000---0.081--3.584%
2018-07-20T10:11:40mikrS069800000025000000012---2.373--8.979%
2019-10-21T15:48:25masserManual testing26300002630000012---0.439--5.704%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.029--
2016-02-23T16:29:18Mark RoseManual testing259260--0.029--
2009-01-29T03:08:00Sturle Sundecelair.ifi260261--0.058--
2012-06-16T18:14:00Grant McCrackenhome261262--0.117--
2013-01-14T11:57:00dbaughManual testing262263--0.374--
2015-02-23T17:25:00VictordeHollanderManual testing263264--0.747--
2015-02-23T17:25:00VictordeHollanderManual testing264265--1.422--
2016-01-18T09:58:45ramgeisManual testing265266--2.844--
2017-09-01T23:24:07Gordon SpenceManual testing266267--5.687--
2019-04-01T13:34:42TJAOIManual testing267268--11.37--
2021-06-14T11:23:25TJAOIManual testing268269--22.75--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.754 GHz-days
Estimated T-Level:22.536
DigitsB1CurvesCompleteFacMiss
2011000142 / 1001.42023.999%
2550000142 / 2800.50760.167%

New Calculation Method

Total ECM effort:14.754 GHz-days
Estimated T-Level:22.536
DigitsB1CompleteFacMiss
20110005.4840.415%
25500000.50760.209%
302500000.03296.849%
3510000000.00199.850%


ECM Summary

B1B2factorcurvesGHz-days
50000500000013513.92
50000675000070.830


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computers9E22B5A13D8126700.203


PRP results:
No PRP results for M2627869


P-1 factor-bounds graph:
B1 = 8000000, B2 = 250000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 2630000, B2 = 26300000 (P-1 stage 2)
B1 = 2630000 (P-1 stage 1)
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (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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TF factor-bounds graph:
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Last modified: 2022-04-03T11:15:48+00:00