is 2 1842887 - 1
has 554765 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LDFD0F0B1ADC8757Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26832.343269.1176 %18428871842887000.92698.0281 %33.270171.5969 %
Target2610.166765.5738 %90007000000.00371.5969 %0.170466.1235 %
Difference+7+32.1765+3.5439 %+1833887+183588700+0.9232+6.4312%+33.0997+5.4734 %

Known prime factors (1 factor, 68.7 bits, 0.00372678% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18428874729706105996664133692168.680128323280428932
22 × 3 × 47797 × 223729663
2019-11-254779722372966332.3430.96241.7909

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-12-31markrtiny275000600000012--0.0467.168%
2015-10-06Bruno Victal5820K.ECM5000001500000012--0.1018.871%
2016-10-27JossManual testing660000660000---4.330%
2016-10-29JossManual testing792000792000---4.597%
2016-11-03JossManual testing11404801140480---5.155%
2017-03-20JossManual testing13685761368576012--0.1609.308%
2018-01-31JossManual testing18428871368576012--0.1969.423%
2018-02-04JossManual testing18428872737152012--0.25410.602%
2018-02-10JossManual testing18428875474304012--0.37211.767%
2018-02-27JossManual testing184288710948608012--0.60612.917%
2018-05-03JossManual testing184288718428870012--0.92713.771%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-01-16ANONYMOUSv4_computers212580.021
2016-02-23Mark RoseManual testing2582600.063
2010-04-08Architects CubedManual testing2602610.083
2016-02-23Mark RoseManual testing2612620.167
2011-01-21GrunwalderGIMPManual testing212630.866
2016-02-23Mark RoseManual testing2622630.533
2015-04-27snme2pm1Manual testing2632641.065
2015-04-27snme2pm1Manual testing2642652.027
2015-09-06ramgeisManual testing2652664.055
2017-12-04TJAOIManual testing2662678.110
2019-06-24TJAOIManual testing26726816.22


ECM factoring results:
Total ECM effort:39.090 GHz-days
Estimated T-Level:25.710
DigitsB1CompleteFacMiss
201100014.9790.000%
25500001.68118.623%
302500000.14286.758%
3510000000.01099.030%


ECM Summary

B1B2factorcurvesGHz-days
500005000000543.627
50000500000020.138
50000660000019515.20
250000400000004720.13


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15Ethan O'Connorv4_computersDFD0F0B1ADC8757C0.100
2015-06-27MadPooManual testingDFD0F0B1ADC8757C0.100


PRP results:
dateuseridcompidcofactorsres64
2019-11-26Niels_Mache_NextcloudSuperDry-X
472970610599666413369
C5D4AE511C785F4E
2019-11-27marssystemssystem03
472970610599666413369
C5D4AE511C785F4E


CERT results:
No CERT results for M1842887


P-1 factor-bounds graph:
B1 = 1842887, B2 = 184288700 (P-1 stage 2)
B1 = 1842887, B2 = 109486080 (P-1 stage 2)
B1 = 1842887, B2 = 54743040 (P-1 stage 2)
B1 = 1842887, B2 = 27371520 (P-1 stage 2)
B1 = 1842887, B2 = 13685760 (P-1 stage 2)
B1 = 1368576, B2 = 13685760 (P-1 stage 2)
B1 = 1842887 (P-1 stage 1)
B1 = 1368576 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1140480 (P-1 stage 1)
B1 = 792000 (P-1 stage 1)
B1 = 660000 (P-1 stage 1)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
103
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105
106
107
103
104
105
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107
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109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00