is 2 4920239 - 1
has 1481140 decimal digits
takes 0.682 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7EFC0CE6E8AD42F8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272194.367368.0556 %400000010397372700114.614311.1989 %308.981671.6330 %
Target2651.482864.6154 %3200035000000.04442.3756 %1.527265.4560 %
Difference+7+192.8845+3.4402 %+3968000+10393872700+114.5699+8.8233%+307.4544+6.1770 %

Known prime factors:
No known factors for M4920239

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-09-18Carsten Kossendeymother30000435000--0.0102.068%
2011-07-14Squeeky_SquirrelT7500_2200600009600006--0.0222.928%
2014-10-19mikrMSI12000003975000012--0.6638.724%
2023-04-06Sid & AndyMagic_8_Ball400000010397372700--130.617.724%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-06-01ANONYMOUSv4_computers212610.031
2010-04-03markroldgamer2612620.062
2011-09-11GrunwalderGIMPManual testing212630.324
2016-02-23Mark RoseManual testing2622630.200
2014-12-29VictordeHollanderManual testing2632651.158
2015-07-25snme2pm1Manual testing2652661.519
2017-10-28YxinityManual testing2662673.038
2018-05-23ramgeisManual testing2672686.075
2021-03-03TJAOIManual testing26826912.15
2021-04-23ANONYMOUSManual testing26927172.90
2021-04-25ANONYMOUSManual testing27127297.20


ECM factoring results:
Total ECM effort:1.655 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.655


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-07-29ANONYMOUSv4_computers7EFC0CE6E8AD42F80.682
1998-08-09ANONYMOUSv4_computers7EFC0CE6E8AD42F80.682
1998-08-30ANONYMOUSv4_computers7EFC0CE6E8AD42F80.682
2000-03-22Stefv4_computers7EFC0CE6E8AD42F80.682


PRP results:
No PRP results for M4920239


CERT results:
No CERT results for M4920239


P-1 factor-bounds graph:
B1 = 4000000, B2 = 10397372700 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
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)
103
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105
106
107
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105
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1010
1011
TF factor-bounds graph:
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271
269
268
267
266
265
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
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Last modified: 2024-03-13T02:15:48+00:00