is 2 4915049 - 1
has 1479578 decimal digits
takes 0.681 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC4CFF42EF779C0FBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272194.572668.0556%1200000397500000.66334.7109%195.235969.5604%1.5049%
PrimeNet2610.062562.2951%220004500000.00913.3038%0.071663.5408%1.2457%
GPU722651.484464.6154%320007000000.01372.3752%1.498165.4558%0.8405%
Difference+7+193.0882+3.4402%+1168000+39050000+0.6496+2.3357%+193.7378+4.1046%+4.1046%

Known prime factors:
No known factors for M4915049

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-27T03:02:00Carsten Kossendeydurandal30000435000---0.010--0.767%
2011-07-13T05:50:00Squeeky_SquirrelT7500_220060000960000---0.022--1.195%
2014-10-05T03:57:00mikrMSI120000039750000---0.663--4.711%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:04Mark RoseManual testing21261--0.062--
2010-04-04T22:45:00markroldgamer261262--0.062--
2011-09-11T02:01:00GrunwalderGIMPManual testing21263--0.325--
2016-02-23T16:39:04Mark RoseManual testing262263--0.200--
2014-12-29T19:38:00VictordeHollanderManual testing263264--0.399--
2014-12-29T19:38:00VictordeHollanderManual testing264265--0.760--
2015-07-25T10:14:00snme2pm1Manual testing265266--1.520--
2017-10-28T09:47:50YxinityManual testing266267--3.041--
2018-05-23T15:00:51ramgeisManual testing267268--6.082--
2021-03-08T12:34:19TJAOIManual testing268269--12.16--
2021-04-23T15:21:19-Anonymous-Manual testing269270--24.33--
2021-04-24T10:38:47-Anonymous-Manual testing270271--48.65--
2021-04-25T19:38:13-Anonymous-Manual testing271272--97.30--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.889 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.889 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.889


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-08-09T00:00:00Filenv4_computersC4CFF42EF779C0FB0.681
1998-09-20T00:00:00Filenv4_computersC4CFF42EF779C0FB0.681
2000-04-19T00:00:00ANONYMOUSv4_computersC4CFF42EF779C0FB0.681


PRP results:
No PRP results for M4915049


P-1 factor-bounds graph:
B1 = 1200000, B2 = 39750000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 60000, B2 = 960000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 30000, B2 = 435000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-04-25T19:38:13+00:00