is 2 1544891 - 1
has 465059 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA20E479795F32A71double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26719.233768.6567 %100000002000000001.31819.7211 %20.551871.7036 %
Target2610.198865.5738 %65003000000.00151.0482 %0.200365.9346 %
Difference+6+19.0348+3.0829 %+9993500+199700000+1.3167+8.6729%+20.3515+5.7690 %

Known prime factors (1 factor, 77.4 bits, 0.00501102% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15448912014551116952931778159832477.41565200428928414101
3 × 7 × 41 × 75726398290841
2016-04-14417572639829084123,505267,213499,080

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers20000290000--0.0022.368%
2013-12-05David Campeaui5-2500k9250002682500012--0.15110.000%
2015-03-09VictordeHollanderManual testing1000000020000000012--1.31814.726%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-10-18Dry Creek Photov4_computers212570.012
2003-08-08ANONYMOUSv4_computers212580.025
2016-02-23Mark RoseManual testing2582600.075
2010-04-29Architects Cubeda3_bu22602610.099
2010-05-24GrunwalderGIMPManual testing212631.033
2016-02-23Mark RoseManual testing2612630.834
2015-02-12snme2pm1Manual testing2632653.689
2015-10-11ramgeisManual testing2652664.837


ECM factoring results:
Total ECM effort:30.034 GHz-days
Estimated T-Level:25.704
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001769.71
500005000000754.191
250000350000005016.13


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-25Dry Creek Photov4_computersA20E479795F32A710.069
2015-07-20MadPooManual testingA20E479795F32A710.069


PRP results:
dateuseridcompidcofactorsres64
2017-10-01Oliver KruseGTX-1
201455111695293177815983
A956616038784804
2017-10-30kkmrkkblmbrbkc4.xlarge
201455111695293177815983
A956616038784804


CERT results:
No CERT results for M1544891


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 925000, B2 = 26825000 (P-1 stage 2)
B1 = 925000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.7 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00