is 2 4978009 - 1
has 1498531 decimal digits
takes 0.690 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD36A8D9DA961A755double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272192.111768.0556%19000050825000.09182.3715%192.203468.8131%0.7576%
PrimeNet2610.061762.2951%220004500000.00913.3108%0.070863.5434%1.2483%
GPU722651.465664.6154%340007000000.01412.4142%1.479765.4696%0.8543%
Difference+7+190.6461+3.4402%+156000+4382500+0.0776-0.0427%+190.7237+3.3435%+3.3435%

Known prime factors:
No known factors for M4978009

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2009-08-27T11:38:00Carsten Kossendeydurandal30000450000---0.011--0.777%
2011-07-29T18:54:00Squeeky_SquirrelT7500_220060000975000---0.022--1.203%
2016-06-15T03:31:41Squeeky_SquirrelP4_260019000050825006---0.092--2.371%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:06Mark RoseManual testing21261--0.062--
2009-12-08T02:36:00markroldgamer261262--0.062--
2011-11-13T15:27:00GrunwalderGIMPManual testing21263--0.321--
2016-02-23T16:39:06Mark RoseManual testing262263--0.197--
2014-12-29T19:38:00VictordeHollanderManual testing263264--0.394--
2014-12-29T19:38:00VictordeHollanderManual testing264265--0.751--
2015-07-30T04:21:00snme2pm1Manual testing265266--1.501--
2017-05-22T07:13:59YxinityManual testing266267--3.002--
2018-06-05T09:54:13ramgeisManual testing267268--6.005--
2021-02-23T10:39:27TJAOIManual testing268269--12.01--
2021-04-23T17:19:13-Anonymous-Manual testing269270--24.02--
2021-04-24T10:37:26-Anonymous-Manual testing270271--48.04--
2021-04-25T10:46:38-Anonymous-Manual testing271272--96.07--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.895 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:1.895 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.895


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-04-12T00:00:00ANONYMOUSv4_computersD36A8D9DA961A7550.690


PRP results:
No PRP results for M4978009


P-1 factor-bounds graph:
B1 = 190000, B2 = 5082500 (P-1 stage 2)
B1 = 190000 (P-1 stage 1)
B1 = 60000, B2 = 975000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 30000, B2 = 450000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-04-25T10:46:38+00:00