is 2 1532647 - 1
has 461373 decimal digits
takes 0.068 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L546E1D8AC2B71A08double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26719.387368.6567 %500000150000000.08354.9613 %19.470970.2117 %
Target2610.200465.5738 %65002750000.00141.0146 %0.201865.9231 %
Difference+6+19.1869+3.0829 %+493500+14725000+0.0822+3.9467%+19.2691+4.2887 %

Known prime factors (1 factor, 75.4 bits, 0.00491650% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1532647482405426226602992621612375.35315737656036471640
23 × 5 × 773 × 87041 × 5847587
2013-10-078704158475874,992.60.02600.0385

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-29Team Prime Ribv4_computers20000285000--0.0022.353%
2011-01-31James HeinrichWHS8000013400006--0.0104.454%
2016-03-17alpertronManual testing5000001500000012
skipped known factor: 48240542622660299262161
---8.696%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-10-29JCv4_computers212570.013
2003-08-08ANONYMOUSv4_computers212580.025
2010-04-26Architects Cubeda3_bu22602610.100
2010-05-04GrunwalderGIMPManual testing212631.041


ECM factoring results:
Total ECM effort:32.223 GHz-days
Estimated T-Level:25.730
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.68718.509%
302500000.14686.420%
3510000000.01098.975%


ECM Summary

B1B2factorcurvesGHz-days
10.056
50000500000025113.89
250000450000005018.27


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-21JCv4_computers546E1D8AC2B71A080.068


PRP results:
dateuseridcompidcofactorsres64
2017-10-01Oliver KruseGTX-1
48240542622660299262161
97725CAEE561DD27
2017-10-30kkmrkkblmbrbkold
48240542622660299262161
97725CAEE561DD27


CERT results:
No CERT results for M1532647


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 285000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
263
261
258
257
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.73 ~= 69-bit
250
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Last modified: 2024-02-29T14:28:04+00:00