is 2 2585647 - 1
has 778358 decimal digits
takes 0.179 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8D911664C72C5C00double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.052267.6471%32000001120000000.91808.0838%23.970270.2624%2.6154%
PrimeNet2590.029762.7119%110002000000.00212.6921%0.031863.7157%1.0038%
GPU722630.617365.0794%120001900000.00221.5059%0.619465.6052%0.5259%
Difference+5+22.4349+2.5677%+3188000+111810000+0.9158+6.5779%+23.3508+4.6572%+4.6572%

Known prime factors (1 factor, 70.0 bits, 0.00270731% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
258564711818710920998276312072270.002228544556178749
12855211 × 17778359
2020-07-181285521117778359130.231.31992.6313

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.237%
2003-11-08T00:00:00Team Prime Ribv4_computers15000206250---0.003--0.767%
2010-11-15T02:50:00Jocelyn LaroucheManual testing2000020000---0.002--0.266%
2011-01-12T23:59:00Jocelyn LaroucheManual testing5000050000---0.005--0.532%
2011-10-12T03:49:00markrtiny1750004112500---0.039--3.176%
2016-08-01T11:00:47mikrMSI320000011200000012---0.918--8.084%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00curtiscv4_computers21259--0.030--
2016-02-23T16:29:17Mark RoseManual testing259260--0.030--
2009-01-31T17:31:00Sturle Sundeklughardt.ifi260261--0.059--
2012-06-21T18:42:00Sebastian HornbostelManual testing261262--0.119--
2013-01-14T11:55:00dbaughManual testing262263--0.380--
2015-02-27T20:35:00VictordeHollanderManual testing263264--0.759--
2015-02-27T20:35:00VictordeHollanderManual testing264265--1.445--
2015-11-08T21:03:08ramgeisManual testing265266--2.890--
2017-08-20T12:59:35Gordon SpenceManual testing266267--5.780--
2019-06-30T15:01:56lycornManual testing267268--11.56--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.973 GHz-days
Estimated T-Level:2.150
DigitsB1CurvesCompleteFacMiss
201100043 / 1000.43064.910%
255000043 / 2800.15485.740%

New Calculation Method

Total ECM effort:3.973 GHz-days
Estimated T-Level:2.150
DigitsB1CompleteFacMiss
20110001.38724.980%
25500000.12588.218%
302500000.00899.231%


ECM Summary

B1B2factorcurvesGHz-days
500005000000423.881
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00curtiscv4_computers8D911664C72C5C000.179
2018-06-21T07:08:29kkmrkkblmbrbkold8D911664C72C5C000.179


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-19T03:57:55CrypticClueManual testing
1181871092099827631207
1570F4946CB66A0Eno
2020-07-20T20:04:27pewlaptop
1181871092099827631207
1570F4946CB66A0Eno


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 175000, B2 = 4112500 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 206250 (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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108
102
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109
TF factor-bounds graph:
268
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266
265
264
263
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261
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2100
Last modified: 2020-07-20T20:04:27+00:00