is 2 2915461 - 1
has 877642 decimal digits
takes 0.225 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3E5E98BEBAFFAD80double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.191867.1642%1000000200000000.22796.0656%10.419869.1559%1.9917%
PrimeNet2590.026362.7119%130002600000.00303.0672%0.029363.8556%1.1437%
GPU722630.547465.0794%160003000000.00351.9109%0.551065.7467%0.6673%
Difference+4+9.6444+2.0848%+984000+19700000+0.2244+4.1547%+9.8688+3.4092%+3.4092%

Known prime factors (1 factor, 76.7 bits, 0.00263138% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
29154611241763370030307208451692476.71721296175288064344
23 × 33 × 41 × 2404717173449
2015-12-244124047171734496,708.214,67327,405

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-02T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.304%
2009-07-03T00:46:00Carsten Kossendeyleela15000168750---0.003--0.862%
2010-12-24T02:50:00Jocelyn LaroucheManual testing2000020000---0.002--0.325%
2011-01-25T19:49:00markrtiny1050002283750---0.025--2.902%
2015-04-25T17:20:00VictordeHollanderManual testing100000020000000---0.228--6.066%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-23T00:00:00BJBv4_computers21259--0.026--
2016-02-23T16:29:24Mark RoseManual testing259260--0.026--
2009-02-12T22:37:00Sturle Sundekrebs.ifi260261--0.053--
2011-12-20T17:17:00Grant McCrackenthumper261262--0.105--
2013-01-07T13:47:00dbaughManual testing262263--0.337--
2015-04-25T17:15:00VictordeHollanderManual testing263264--0.673--
2015-04-25T17:15:00VictordeHollanderManual testing264265--1.282--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.154 GHz-days
Estimated T-Level:0.550
DigitsB1CurvesCompleteFacMiss
201100011 / 1000.11089.534%
255000011 / 2800.03996.141%

New Calculation Method

Total ECM effort:1.154 GHz-days
Estimated T-Level:0.550
DigitsB1CompleteFacMiss
20110000.35570.129%
25500000.03296.844%
302500000.00299.803%


ECM Summary

B1B2factorcurvesGHz-days
50000500000090.944
50000500000020.210


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-08-16T00:00:00ANONYMOUSv4_computers3E5E98BEBAFFAD800.225
1999-07-27T00:00:00foxkidv4_computers3E5E98BEBAFFAD800.225


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:32:41alpertronManual testing
124176337003030720845169
320223EFA34EF5__no
2017-11-18T01:26:51Oliver KruseThreadripper
124176337003030720845169
320223EFA34EF5__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 105000, B2 = 2283750 (P-1 stage 2)
B1 = 105000 (P-1 stage 1)
B1 = 15000, B2 = 168750 (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: 2017-11-18T01:26:51+00:00