is 2 195203 - 1
has 58762 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual267152.220673.1343 %10000000020000000001.360712.3091 %153.581376.4413 %
Target2440.000059.0909 %36004000000.00028.8297 %0.000262.7031 %
Difference+23+152.2206+14.0434 %+99996400+1999600000+1.3606+3.4794%+153.5812+13.7382 %

Known prime factors (2 factors, 58.4 bits, 0.02993184% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
195203390407618.5751
1
-111.789e-136.686e-91.361e-8
1952039931600698971239.8532543916
22 × 3 × 239 × 887
2008-07-272398873.752e-71.834e-63.252e-6

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2017-06-09kkmrkkblmbrbkManual testing100000000200000000012
skipped known factor: 390407
skipped known factor: 993160069897
---42.000%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-07-27J FeitsmaManual testing??
39.853
12


ECM factoring results:
Total ECM effort:60.972 GHz-days
Estimated T-Level:30.464
DigitsB1CompleteFacMiss
201100064.8890.000%
25500009.6470.006%
302500001.06534.470%
3510000000.09391.136%
4030000000.00799.335%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002811.371
250000250000003899.487
25000036000000501.396
2500003725000070.198
2500003809583270.200
25000038500000280.804
250000367537170121.965
25000055133578571.650
93037320540081105043.90


Lucas-Lehmer results:
No L-L results for M195203


PRP results:
dateuseridcompidcofactorsres64
2017-09-22Oliver KruseOllaptop
390407
993160069897
B859256EF022B975
2017-09-22Oliver KruseManual testing
390407
993160069897
B859256EF022B975
2017-10-12kkmrkkblmbrbkc4.xlarge
390407
993160069897
B859256EF022B975
2020-04-17Oliver KruseAddPrpType5
390407
993160069897
4F16668CA0AF2668
2022-05-12Jorge CoveiroManual testing
390407
4F16668CA0AF2668
2023-08-24USAFSS6917th_Scty_Sq
390407
993160069897
4F16668CA0AF2668


CERT results:
dateuseridcompid
2023-08-24WeakForceBosonJOHN9456789tommy


P-1 factor-bounds graph:
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
108
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=30.46 ~= 85-bit
250
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270
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290
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Last modified: 2024-02-29T14:28:04+00:00