is 2 1508383 - 1
has 454069 decimal digits
takes 0.067 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
Actual26719.699268.6567%500000150000000.08354.9517%19.782770.2087%1.5520%
PrimeNet2570.012763.1579%65001000000.00082.3430%0.013564.0211%0.8632%
GPU722610.203665.5738%6000500000.00050.9491%0.204265.9005%0.3268%
Difference+6+19.4955+3.0829%+494000+14950000+0.0830+4.0026%+19.5785+4.3082%+4.3082%

Known prime factors (2 factors, 122.2 bits, 0.00810326% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
150838324817878013911341.175822665
5 × 41 × 4013
-4140132.070e-71.667e-52.647e-5
150838325095795029901936403303692581.054831877415414451648
26 × 32 × 11 × 29 × 4527371862017
2019-06-07644527371862017547,30815,97629,838

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1508383622824379714195118486885710739774327937122.228
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:15:38alpertronManual testing5000001500000012-
skipped known factor: 2481787801391
--0.084--4.952%


Trial Factoring results:
No TF results for M1508383


ECM factoring results:

Old Calculation Method

Total ECM effort:30.078 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:30.078 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.65119.189%
302500000.14186.866%
3510000000.01099.021%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001277.080
5000050000001246.913
250000350000005016.09


Lucas-Lehmer results:
No L-L results for M1508383


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T11:02:59Oliver KruseGTX-1
2481787801391
7A3C99AE454BE8__no
2017-10-29T13:30:54kkmrkkblmbrbkold
2481787801391
7A3C99AE454BE8__no
2019-06-07T23:07:08treborLaptop
2481787801391
2509579502990193640330369
F0FF0B4323BFA940no
2019-06-07T23:12:18ATHec2-PRPCFDC
2481787801391
2509579502990193640330369
F0FF0B4323BFA940no


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: 2022-03-17T11:20:43+00:00