is 2 1625993 - 1
has 489473 decimal digits
takes 0.073 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8FA0E6B7D10CA9B7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.274368.6567%1000000200000000.13185.6783%18.406170.4365%1.7798%
PrimeNet2570.011863.1579%70001200000.00092.5561%0.012764.0996%0.9417%
GPU722610.188965.5738%6500650000.00061.0899%0.189565.9490%0.3752%
Difference+6+18.0854+3.0829%+993500+19935000+0.1312+4.5884%+18.2166+4.4875%+4.4875%

Known prime factors (2 factors, 161.0 bits, 0.00990371% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16259934292571112319101296170812478.506131998449941638780
22 × 5 × 17 × 19 × 47 × 434748863519
2019-11-044743474886351966,8221,534.12,865.2
162599369697860192008906813653372582.5272143239859950470476
22 × 13 × 107 × 179 × 2293 × 938483347
2013-11-1122939384833471,159,9093.31176.1851

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1625993299183021250672884162590365750624502234607652129749161.034
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-12-06T18:05:00BigBrotherWinston100000020000000---0.132--5.678%
2016-03-17T19:17:33alpertronManual testing5000001500000012---0.084--4.997%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-06-30T00:00:00ANONYMOUSv4_computers21258--0.024--
2010-04-30T08:20:00Architects Cubeda3_lm260261--0.094--
2010-08-22T04:21:00GrunwalderGIMPManual testing21263--0.982--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.927 GHz-days
Estimated T-Level:24.429
DigitsB1CurvesCompleteFacMiss
2011000248 / 1002.4808.270%
2550000248 / 2800.88641.177%

New Calculation Method

Total ECM effort:13.927 GHz-days
Estimated T-Level:24.429
DigitsB1CompleteFacMiss
20110008.0000.034%
25500000.72348.528%
302500000.04595.645%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000020511.51
500005000000432.415


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers8FA0E6B7D10CA9B70.073


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T15:03:16Oliver KruseGTX-2
6969786019200890681365337
FFD94F012E6EFF__no
2017-11-01T16:52:45kkmrkkblmbrbkc4.xlarge
6969786019200890681365337
FFD94F012E6EFF__no
2019-11-04T18:40:49mnd9printer
429257111231910129617081
6969786019200890681365337
0B00F5B275532620no
2019-11-04T18:54:24ATHec2-PRPCFDC
429257111231910129617081
6969786019200890681365337
0B00F5B275532620no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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1010
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TF factor-bounds graph:
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261
258
257
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2100
Last modified: 2019-11-11T13:14:23+00:00