is 2 4800623 - 1
has 1445132 decimal digits
takes 0.632 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBBD479984ADF8A04double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272199.210368.0556%420000109200000.18943.1884%199.399769.0741%1.0185%
PrimeNet2610.064062.2951%200004500000.00833.2248%0.072363.5110%1.2159%
GPU722651.519764.6154%320006500000.01252.3222%1.532365.4371%0.8217%
Difference+7+197.6906+3.4402%+388000+10270000+0.1769+0.8661%+197.8674+3.6370%+3.6370%

Known prime factors:
No known factors for M4800623

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-28T19:57:00Carsten Kossendeydurandal30000420000---0.010--0.756%
2013-11-29T23:25:00David Campeaui5-2500k42000010920000---0.189--3.188%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:00Mark RoseManual testing21261--0.064--
2010-05-13T20:52:00markrManual testing261262--0.064--
2011-09-28T18:56:00GrunwalderGIMPManual testing21263--0.332--
2016-02-23T16:39:00Mark RoseManual testing262263--0.204--
2015-01-03T18:51:00VictordeHollanderManual testing263264--0.409--
2015-01-03T18:51:00VictordeHollanderManual testing264265--0.778--
2015-07-17T22:44:00snme2pm1Manual testing265266--1.557--
2017-11-17T15:13:43YxinityManual testing266267--3.113--
2018-05-08T11:46:17ramgeisManual testing267268--6.226--
2020-12-02T16:23:50-Anonymous-Manual testing268269--12.45--
2020-12-02T16:23:50-Anonymous-Manual testing269270--24.91--
2020-12-02T16:23:50-Anonymous-Manual testing270271--49.81--
2020-12-06T12:31:04-Anonymous-Manual testing271272--99.6--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.784 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.784 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.784


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-25T00:00:00mhoneyv4_computersBBD479984ADF8A040.632
2000-07-12T00:00:00ANONYMOUSv4_computersBBD479984ADF8A040.632


PRP results:
No PRP results for M4800623


P-1 factor-bounds graph:
B1 = 420000, B2 = 10920000 (P-1 stage 2)
B1 = 420000 (P-1 stage 1)
B1 = 30000, B2 = 420000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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108
TF factor-bounds graph:
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Last modified: 2020-12-06T12:31:04+00:00