is 2 2175479 - 1
has 654885 decimal digits
takes 0.143 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB7A376C1BE7CAD62double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26954.878468.1159%50000002000000001.48968.2813%56.368070.7564%2.6404%
PrimeNet2580.017762.0690%100001800000.00182.8572%0.019563.1527%1.0838%
GPU722620.282464.5161%110001600000.00181.5681%0.284265.0725%0.5564%
Difference+7+54.5960+3.5998%+4989000+199840000+1.4877+6.7132%+56.0837+5.6838%+5.6838%

Known prime factors:
No known factors for M2175479

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-07T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.182%
2010-11-05T01:17:00Jocelyn LaroucheManual testing1500015000---0.001--0.165%
2010-11-07T21:16:00Jocelyn LaroucheManual testing3000030000---0.003--0.300%
2011-01-15T07:30:00markrtiny900001620000---0.017--1.949%
2014-06-13T02:40:00Jocelyn LaroucheManual testing119504119504---0.011--0.773%
2014-10-05T22:22:00Jocelyn LaroucheManual testing149008149008---0.014--0.878%
2015-12-22T14:03:56HBendtzManual testing7000002100000012---0.172--4.735%
2019-11-18T04:41:25mikrMSI500000020000000012---1.490--8.281%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers21258--0.018--
2016-02-23T16:29:07Mark RoseManual testing258260--0.053--
2009-01-04T16:59:00Sturle Sundeantonov.ifi260261--0.071--
2009-01-06T19:17:00Sturle Sundegonsha.ifi261262--0.141--
2013-09-09T08:39:00ramgeisManual testing262263--0.451--
2015-03-25T10:09:00VictordeHollanderManual testing263264--0.902--
2015-03-25T10:09:00VictordeHollanderManual testing264265--1.717--
2016-01-02T13:50:57ramgeisManual testing265266--3.435--
2016-11-17T17:00:11Gordon SpenceManual testing266267--6.870--
2019-04-29T13:20:33TJAOIManual testing267268--13.74--
2021-07-15T09:28:28TJAOIManual testing268269--27.48--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.774 GHz-days
Estimated T-Level:23.679
DigitsB1CurvesCompleteFacMiss
2011000206 / 1002.06012.614%
2550000206 / 2800.73647.853%

New Calculation Method

Total ECM effort:17.774 GHz-days
Estimated T-Level:23.679
DigitsB1CompleteFacMiss
20110007.9680.035%
25500000.73747.854%
302500000.04795.455%
3510000000.00299.783%


ECM Summary

B1B2factorcurvesGHz-days
50000500000019216.41
50000645000070.670
50000690000070.692


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computersB7A376C1BE7CAD620.143
2018-04-12T20:25:08kkmrkkblmbrbkoldB7A376C1BE7CAD620.143


PRP results:
No PRP results for M2175479


P-1 factor-bounds graph:
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 700000, B2 = 21000000 (P-1 stage 2)
B1 = 700000 (P-1 stage 1)
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 149008 (P-1 stage 1)
B1 = 119504 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 30000 (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: 2022-07-12T14:45:37+00:00