is 2 1557593 - 1
has 468883 decimal digits
takes 0.070 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
Actual26719.076868.6567%500000150000000.08354.9710%19.160470.2148%1.5581%
PrimeNet2570.012363.1579%65001100000.00082.4228%0.013164.0505%0.8926%
GPU722610.197265.5738%6500600000.00061.0501%0.197865.9353%0.3615%
Difference+6+18.8796+3.0829%+493500+14940000+0.0829+3.9209%+18.9625+4.2795%+4.2795%

Known prime factors (2 factors, 99.3 bits, 0.00637824% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15575939345559723.1563
3
-137.179e-137.182e-81.318e-7
1557593862678788522630673578412376.19127692689570466440
23 × 5 × 13 × 31 × 1717908782287
2017-12-0231171790878228710,9316,061.911,322

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
15575938062215516186767795136771781193099.347
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:16:17alpertronManual testing5000001500000012-
skipped known factor: 9345559
--0.084--4.971%


Trial Factoring results:
No TF results for M1557593


ECM factoring results:

Old Calculation Method

Total ECM effort:31.265 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:31.265 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.87
50000500000030.168
250000400000005017.23


Lucas-Lehmer results:
No L-L results for M1557593


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T19:52:32Oliver KruseGTX-1
9345559
880972B2D060FC__no
2017-10-30T21:40:12kkmrkkblmbrbkc4.xlarge
9345559
880972B2D060FC__no
2017-12-03T09:54:34kkmrkkblmbrbkc4.xlarge
9345559
86267878852263067357841
70E59C0C81508A__no
2017-12-04T04:27:43Oliver KruseGTX-1
9345559
86267878852263067357841
70E59C0C81508A__no


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: 2022-06-16T11:18:30+00:00