is 2 1552531 - 1
has 467359 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-L0CB09988F4998847double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26719.139068.6567 %500000150000000.08354.9690 %19.222670.2142 %
Target2610.197965.5738 %65003000000.00151.0493 %0.199365.9350 %
Difference+6+18.9412+3.0829 %+493500+14700000+0.0821+3.9197%+19.0233+4.2792 %

Known prime factors (2 factors, 163.4 bits, 0.01052768% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
155253122653127046893717611960.974729554741480
23 × 5 × 163 × 111894899
2008-03-031631118948990.09890.39480.7375
1552531702843898670906956952690332715331102.4712263542237388196940842696
23 × 282942779673524617605337
2019-07-1982829427796735246176053378.269e+109.984e+141.865e+15

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers20000290000--0.0022.370%
2016-03-17alpertronManual testing5000001500000012---8.708%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-01-10ANONYMOUSv4_computers212570.012
2000-01-19ANONYMOUSv4_computers212570.012
2003-08-08ANONYMOUSv4_computers212580.025


ECM factoring results:
Total ECM effort:31.240 GHz-days
Estimated T-Level:25.717
DigitsB1CompleteFacMiss
201100014.6150.000%
25500001.67118.807%
302500000.14386.643%
3510000000.01099.006%


ECM Summary

B1B2factorcurvesGHz-days
10.042
50000500000019110.68
500005000000593.298
250000400000005017.22


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14ANONYMOUSv4_computers0CB09988F49988470.069
2000-01-19ANONYMOUSv4_computers0CB09988F49988470.069


PRP results:
dateuseridcompidcofactorsres64
2017-10-01Oliver KruseDoppelherz
2265312704689371761
4198F30AAFA5EB53
2017-10-30kkmrkkblmbrbkc4.xlarge
2265312704689371761
4198F30AAFA5EB53
2019-07-19ATHec2-PRPCF
2265312704689371761
7028438986709069569526903327153
B28F91BF84D00138
2019-08-23GANKL-SCH05
2265312704689371761
7028438986709069569526903327153
B28F91BF84D00138


CERT results:
No CERT results for M1552531


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (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:
258
257
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00