is 2 4851127 - 1
has 1460335 decimal digits
takes 0.672 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LD18F411719A22F60double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.125265.6716 %3200002243412602.51748.0952 %8.642668.4506 %
Target2651.503964.6154 %3200032500000.04172.3263 %1.545665.4386 %
Difference+2+4.6212+1.0563 %+288000+221091260+2.4757+5.7688%+7.0970+3.0120 %

Known prime factors (1 factor, 63.6 bits, 0.00131122% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4851127140666526523721473372063.6091449833477084
22 × 41 × 15551 × 568481
2010-04-01155515684810.32900.00920.0116

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-09-04Carsten Kossendeymother30000435000--0.0102.062%
2023-04-13Kevin_9611Factor_2320000224341260
skipped known factor: 14066652652372147337
--2.8689.655%


Trial Factoring results:
5758596061626364656667
No TF results for M4851127


ECM factoring results:
Total ECM effort:0.263 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.263


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-06-07ANONYMOUSv4_computersD18F411719A22F600.672
2000-06-23ANONYMOUSv4_computersD18F411719A22F600.672


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
14066652652372147337
FD332CA9810C2620
2018-03-29ATHec2-PRPCFDC
14066652652372147337
FD332CA9810C2620


CERT results:
No CERT results for M4851127


P-1 factor-bounds graph:
B1 = 320000, B2 = 224341260 (P-1 stage 2)
B1 = 320000 (P-1 stage 1)
B1 = 30000, B2 = 435000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
this exponent TF target: 65
TF double-checked to: 67
250
260
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Last modified: 2024-02-09T03:30:02+00:00