is 2 256483 - 1
has 77210 decimal digits
takes 0.002 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actualunknown30000000100358126969105,417.947373.0282%5,417.947373.0282%73.0282%
PrimeNet2400.000055.0000%2600700000.000114.2575%0.000161.4159%6.4159%
GPU722440.000059.0909%45001100000.000110.2004%0.000163.2638%4.1729%
Difference-440.0000-59.0909%+29995500+10035812586910+5,417.9472+62.8278%+5,417.9472+9.7644%+9.7644%

Known prime factors (2 factors, 137.4 bits, 0.05355159% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25648311618679911030.1142265
3 × 5 × 151
-51518.311e-101.284e-71.565e-7
25648319121939153428360002499488845281733107.237372772058058981686944153976
23 × 647 × 81083 × 888217396434956347
2020-11-25810838882173964349563476.823e+11479,489,358895,552,592

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
25648322217169028218049398528836083194358608064742137.351
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2021-09-06T12:48:01Oliver KruseOllaptop30000000300000000024-
skipped known factor: 1161867991
--1.901--44.071%
2022-04-27T19:27:36Oliver KruseThreadripper-PC3000000010035812696910-
skipped known factor: 1161867991
--5,418--63.173%


Trial Factoring results:
No TF results for M256483


ECM factoring results:

Old Calculation Method

Total ECM effort:11.370 GHz-days
Estimated T-Level:26.984
DigitsB1CurvesCompleteFacMiss
2011000535 / 1005.3500.462%
2550000535 / 2801.91114.747%
30250000254 / 6400.39767.221%

New Calculation Method

Total ECM effort:11.370 GHz-days
Estimated T-Level:26.984
DigitsB1CompleteFacMiss
201100030.2310.000%
25500003.8862.053%
302500000.38268.279%
3510000000.03097.060%
4030000000.00299.807%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002812.048
250000250000002348.526
2500002500000060.219
2500003350000070.284
2500003650000070.294


Lucas-Lehmer results:
No L-L results for M256483


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-22T07:50:16Oliver KruseOllaptop
1161867991
1FDC7C94632104__no
2017-09-22T10:06:37Oliver KruseManual testing
1161867991
1FDC7C94632104__no
2017-10-12T18:36:45kkmrkkblmbrbkc4.xlarge1FDC7C94632104__no
2020-04-17T20:17:25Oliver KruseAddPrpType5
1161867991
0CD3FBD6CCFB5A__no
2020-11-25T15:01:32ee33t1hp8300
1161867991
191219391534283600024994888452817
0CD3FBD6CCFB5A21no


P-1 factor-bounds graph:
B1 = 30000000, B2 = 10035812696910 (P-1 stage 2)
B1 = 30000000, B2 = 3000000000 (P-1 stage 2)
B1 = 30000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-27T16:05:42+00:00