is 2 2120341 - 1
has 638287 decimal digits
takes 0.139 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
Actual26714.013767.1642%500000150000000.12305.1592%14.136768.8582%1.6941%
PrimeNet2580.018162.0690%90001600000.00162.6826%0.019863.0865%1.0175%
GPU722620.289764.5161%100001400000.00161.4542%0.291465.0321%0.5160%
Difference+5+13.7240+2.6481%+490000+14860000+0.1214+3.7050%+13.8454+3.8261%+3.8261%

Known prime factors (2 factors, 96.2 bits, 0.00453635% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
212034197535687826.53923
23
-1234.237e-122.096e-72.096e-7
21203419240999975014401471192169.647217913061507899
31 × 7029453597029
2022-06-2531702945359702996.57136,51368,196

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
2120341901327281130012482386327357532996.186
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:12:47alpertronManual testing5000001500000012-
skipped known factor: 97535687
--0.123--5.159%


Trial Factoring results:
No TF results for M2120341


ECM factoring results:

Old Calculation Method

Total ECM effort:2.295 GHz-days
Estimated T-Level:1.300
DigitsB1CurvesCompleteFacMiss
201100026 / 1000.26077.004%
255000026 / 2800.09391.117%

New Calculation Method

Total ECM effort:2.295 GHz-days
Estimated T-Level:1.300
DigitsB1CompleteFacMiss
20110001.01936.087%
25500000.09490.989%
302500000.00699.405%


ECM Summary

B1B2factorcurvesGHz-days
500005000000201.704
50000690000060.591


Lucas-Lehmer results:
No L-L results for M2120341


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-07T06:27:24Oliver KruseGTX-1
97535687
0F31048FF61F32__no
2017-11-17T17:21:31kkmrkkblmbrbkc4.xlarge
97535687
0F31048FF61F32__no
2022-07-01T11:37:20Funky Waddlemain
97535687
924099997501440147119
00C612F15DF56B42no
2022-07-25T03:33:43some-studentsGIMPS_IN_SHANGHAI
97535687
924099997501440147119
00C612F15DF56B42no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-07-25T03:33:43+00:00