is 2 1504879 - 1
has 453014 decimal digits
takes 0.067 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC178F40CB578C0ABdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.745168.6567%500000150000000.08354.9503%19.828670.2083%1.5516%
PrimeNet2570.012863.1579%65001000000.00082.3419%0.013564.0207%0.8628%
GPU722610.204165.5738%6000500000.00050.9486%0.204765.9004%0.3266%
Difference+6+19.5409+3.0829%+494000+14950000+0.0830+4.0017%+19.6239+4.3080%+4.3080%

Known prime factors (1 factor, 67.5 bits, 0.00448339% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15048792043389282633178336172167.47067892145568952
23 × 199 × 42645820081
2013-07-121994264582008133.038150.48281.06

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-26T13:39:00James HeinrichWHS800001280000---0.009--2.162%
2016-03-17T19:15:34alpertronManual testing5000001500000012---0.084--4.950%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.026--
2010-02-24T20:18:00GrunwalderGIMPManual testing21263--1.061--


ECM factoring results:

Old Calculation Method

Total ECM effort:30.978 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:30.978 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.1670.001%
25500001.38125.135%
302500000.11689.052%
3510000000.00899.201%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024813.82
250000400000005017.16


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-18T00:00:00ANONYMOUSv4_computersC178F40CB578C0AB0.067


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T10:21:50Oliver KruseGTX-3
204338928263317833617
CC607B44B54997__no
2017-10-29T07:48:51kkmrkkblmbrbkc4.xlarge
204338928263317833617
CC607B44B54997__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1280000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
101
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103
104
105
106
101
102
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104
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108
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1010
1011
TF factor-bounds graph:
267
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258
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260
270
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290
2100
Last modified: 2022-05-26T10:14:32+00:00