is 2 631247 - 1
has 190025 decimal digits
takes 0.010 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LDD91281AEFF67516double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26747.071870.1493 %200000061997535607.483611.9257 %54.555473.7092 %
Target2440.000054.5455 %1100020000000.002615.9038 %0.002661.7745 %
Difference+23+47.0718+15.6038 %+1989000+6197753560+7.4810-3.9781 %+54.5527+11.9347 %

Known prime factors (2 factors, 165.5 bits, 0.02621847% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
6312477896678100989934445316312479.386625482426133505145
3 × 5 × 17 × 29 × 269 × 314430490879
2019-03-22269314430490879193,954377.43704.93
631247839479134807802078646917372686.11866493712826183893044
22 × 1861 × 10151 × 414397 × 2123483
2013-05-30414397212348324,826,2110.01120.0186

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-12-31Alex Kruppav4_computers200040000--8.97000e-58.370%
2001-05-27Alex Kruppav4_computers1000004000000--0.00724.344%
2002-05-11ANONYMOUSv4_computers163841638400--0.00219.897%
2002-06-29ANONYMOUSv4_computers32768327680012--0.00522.598%
2002-10-07ANONYMOUSv4_computers65536655360012--0.00925.251%
2003-05-19ANONYMOUSv4_computers1310721310720012--0.01827.849%
2011-07-10JossManual testing361945361945--0.00816.804%
2011-09-05JossManual testing603241603241--0.01318.382%
2012-06-19JossManual testing631357631357--0.01418.522%
2013-05-30LaurVManual testing31000003100000612686.1180.01723.384%
2016-03-17alpertronManual testing10000003000000012
skipped known factor: 83947913480780207864691737
---31.561%
2023-01-14USAFSSUSAFSACS20000006199753560
skipped known factor: 83947913480780207864691737
--8.66046.403%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-01-04ANONYMOUSv4_computers2532540.002
2022-03-07LordJuliusManual testing254255
2001-04-15ANONYMOUSv4_computers212560.015
2001-10-25ANONYMOUSv4_computers212570.030
2003-11-08ANONYMOUSv4_computers212580.061
2008-10-11Sturle Sundebuxtehude.ifi2582590.061
2008-10-11Sturle Sundebuxtehude.ifi2592600.122
2011-01-06Sid & AndyToy_Soldier2602610.243


ECM factoring results:
Total ECM effort:18.587 GHz-days
Estimated T-Level:26.530
DigitsB1CompleteFacMiss
201100024.8080.000%
25500003.1824.149%
302500000.30673.637%
3510000000.02397.679%
4030000000.00299.849%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002814.558
25000025000000262.211
25000025000000181.531
2500004000000010010.29


Lucas-Lehmer results:
No L-L results for M631247


PRP results:
dateuseridcompidcofactorsres64
2017-09-27Oliver KruseGTX-2
83947913480780207864691737
DC26EA4B865E1FB0
2017-09-28Oliver KruseManual testing
83947913480780207864691737
DC26EA4B865E1FB0
2017-11-09kkmrkkblmbrbkc4.large
83947913480780207864691737
DC26EA4B865E1FB0
2019-03-22_p95holder_TFL16_PRPt11-E_b
789667810098993444531631
83947913480780207864691737
B260440C3E39FF42
2019-03-22ATHec2-PRPCFDC
83947913480780207864691737
789667810098993444531631
B260440C3E39FF42


CERT results:
No CERT results for M631247


P-1 factor-bounds graph:
B1 = 2000000, B2 = 6199753560 (P-1 stage 2)
B1 = 3100000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 631357 (P-1 stage 1)
B1 = 603241 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 361945 (P-1 stage 1)
B1 = 100000, B2 = 4000000 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 40000 (P-1 stage 2)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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258
257
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254
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=26.53 ~= 72-bit
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Last modified: 2024-02-09T03:30:02+00:00