is 2 1692181 - 1
has 509398 decimal digits
takes 0.080 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF4FF4A5F57378D33double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.559568.6567%995000288550000.17156.0932%17.731070.5665%1.9098%
PrimeNet2570.011363.1579%80001300000.00102.7289%0.012364.1633%1.0054%
GPU722610.181565.5738%7000900000.00081.2574%0.182366.0066%0.4329%
Difference+6+17.3780+3.0829%+988000+28765000+0.1707+4.8358%+17.5487+4.5599%+4.5599%

Known prime factors (1 factor, 77.9 bits, 0.00460484% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16921812863587338810817621198712477.92284612323942025635
5 × 7 × 2417494969772161
2014-09-017241749496977216123,1588,988,09516,787,259

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-26T00:23:00Jocelyn LaroucheManual testing5000050000---0.003--0.570%
2011-02-08T05:49:00Carsten Kossendeyleela900001485000---0.011--2.341%
2014-01-14T01:26:00David Campeaui5-2500k99500028855000---0.171--6.093%
2016-03-17T19:18:48alpertronManual testing5000001500000012---0.088--5.021%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-03-07T00:00:00ANONYMOUSv4_computers21258--0.023--
2003-03-16T00:00:00ANONYMOUSv4_computers21258--0.023--
2022-03-08T23:06:22LordJuliusManual testing258260--0.068--
2022-03-09T02:40:39LordJuliusManual testing21260--0.091--
2010-04-24T12:42:00Architects Cubedm1_tt260261--0.091--
2010-09-26T01:51:00GrunwalderGIMPManual testing21263--0.943--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.912 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.912 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024914.79
50000500000020.119


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computersF4FF4A5F57378D330.080


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T02:10:14Oliver KruseGTX-3
286358733881081762119871
DEC199753662E3__no
2017-11-03T11:40:33kkmrkkblmbrbkc4.xlarge
286358733881081762119871
DEC199753662E3__no


P-1 factor-bounds graph:
B1 = 995000, B2 = 28855000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 995000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 90000, B2 = 1485000 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-09T02:40:39+00:00