is 2 1687177 - 1
has 507891 decimal digits
takes 0.079 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L021237EEBDCAFCFBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.611668.6567%500000150000000.08805.0192%17.699670.2299%1.5732%
PrimeNet2570.011463.1579%80001300000.00102.7274%0.012464.1627%1.0048%
GPU722610.182165.5738%7000900000.00081.2566%0.182966.0064%0.4326%
Difference+6+17.4296+3.0829%+493000+14910000+0.0872+3.7626%+17.5168+4.2235%+4.2235%

Known prime factors (2 factors, 126.2 bits, 0.00747968% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16871774431322678450438071858.621131323586039
883 × 9533 × 15601
-9533156010.03690.00070.0013
16871772198209144465102783272167.57565144591956419
3 × 21714863985473
2018-02-2632171486398547326.96580,735150,790

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
16871779740974033845345227594482077107767088938126.195
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:18:44alpertronManual testing5000001500000012-
skipped known factor: 443132267845043807
--0.088--5.019%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-17T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-03-16T00:00:00ANONYMOUSv4_computers21258--0.023--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.086 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:15.086 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025315.03
50000500000010.059


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computers021237EEBDCAFCFB0.079


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T01:14:42Oliver KruseGTX-3
443132267845043807
367FAC4817EC26__no
2017-11-03T08:18:16kkmrkkblmbrbkc4.xlarge
443132267845043807
367FAC4817EC26__no
2018-02-26T05:14:38ATHec2-1xd
443132267845043807
219820914446510278327
FBACE84E164BD0__no
2018-02-26T14:48:30kkmrkkblmbrbkc5.xlarge
443132267845043807
219820914446510278327
FBACE84E164BD0__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: 2020-01-27T11:16:38+00:00