is 2 4780337 - 1
has 1439025 decimal digits
takes 0.629 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 L-L tests remaining
ResidueStatus
L-L28BD8EC235DDDC42double-checked
PRPB4D9AC5C8D627A__

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271100.009367.6056%89199374449742536.23878.9250%106.248070.4968%2.8912%
PrimeNet2610.064362.2951%200004500000.00833.2225%0.072663.5101%1.2150%
GPU722651.526264.6154%300006500000.01222.2851%1.538465.4240%0.8086%
Difference+6+98.4831+2.9902%+8889937+444324253+6.2265+6.6399%+104.7096+5.0729%+5.0729%

Known prime factors (1 factor, 132.8 bits, 0.00277903% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4780337979472711170735692303425794269208702412940132.8471024480817116801276043326855689472
28 × 17 × 53 × 73 × 2081 × 3739 × 83639 × 1748749 × 53462881
2021-08-311748749534628813.102e+100.87181.0386

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-28T03:11:00Carsten Kossendeydurandal30000412500---0.010--0.870%
2013-10-13T20:28:00Squeeky_SquirrelT7500_22001650004166250---0.073--2.458%
2021-08-31T00:33:56LaurVManual testing891993744497425340132.8476.2391.25912.488.925%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-16T00:00:00ANONYMOUSv4_computers?261--0.032--
2010-05-27T00:28:00markroldgamer261262--0.064--
2011-10-10T00:31:00GrunwalderGIMPManual testing21263--0.334--
2016-02-23T16:39:00Mark RoseManual testing262263--0.205--
2015-01-11T14:01:00VictordeHollanderManual testing263264--0.411--
2015-01-11T14:01:00VictordeHollanderManual testing264265--0.782--
2015-07-16T21:17:00snme2pm1Manual testing265266--1.563--
2017-11-22T01:17:00YxinityManual testing266267--3.126--
2018-09-22T14:33:05YxinityManual testing267268--6.253--
2021-03-29T10:56:15TJAOIManual testing268269--12.51--
2021-08-18T05:53:25SRBaseManual testing269270--25.01--
2021-09-01T16:54:52SRBaseManual testing270271--50.02--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.782 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.782 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.29074.802%
25500000.02697.410%
302500000.00299.839%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.782


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-28T00:00:00ANONYMOUSv4_computers28BD8EC235DDDC420.629
2000-01-12T00:00:00ANONYMOUSv4_computers28BD8EC235DDDC420.629


PRP results:
dateuseridcompidcofactorsres64PRP
2021-08-31T20:37:12LaurVbutu
9794727111707356923034257942692087024129
B4D9AC5C8D627A__no


P-1 factor-bounds graph:
B1 = 8919937, B2 = 444974253 (P-1 stage 2)
B1 = 8919937 (P-1 stage 1)
B1 = 165000, B2 = 4166250 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 30000, B2 = 412500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-09-01T16:54:52+00:00