is 2 1710221 - 1
has 514828 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-L5EAB44A3C2E8062Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual270139.719270.0000%500000150000000.08803.7425%139.807271.1227%1.1227%
PrimeNet2570.011263.1579%80001400000.00102.7903%0.012364.1859%1.0280%
GPU722610.179665.5738%70001000000.00081.3030%0.180466.0223%0.4486%
Difference+9+139.5395+4.4262%+493000+14900000+0.0872+2.4395%+139.6267+5.1004%+5.1004%

Known prime factors (1 factor, 66.0 bits, 0.00385677% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1710221717309979234674180072065.95920971265679543
3 × 6661 × 1049455321
2014-02-18666110494553216.76563.90227.2875

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-12T05:42:00Carsten Kossendeyleela900001507500---0.011--1.624%
2016-03-16T12:30:10alpertronManual testing5000001500000012---0.088--3.742%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-21T13:12:00Architects Cubeda3_bu2260261--0.090--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.933--
2013-08-13T23:31:00BloodIceManual testing263264--1.148--
2013-09-04T20:47:00David CampeauManual testing264265--2.185--
2014-01-18T11:20:00Never Odd Or EvenManual testing265266--4.369--
2014-02-18T12:57:00Never Odd Or EvenManual testing26526665.959202.5000.1645.082
2014-01-18T11:20:00Never Odd Or EvenManual testing266267--8.739--
2014-01-18T11:20:00Never Odd Or EvenManual testing267268--17.48--
2014-01-18T11:20:00Never Odd Or EvenManual testing268269--34.96--
2014-01-18T11:20:00Never Odd Or EvenManual testing269270--69.91--


ECM factoring results:

Old Calculation Method

Total ECM effort:15.286 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:15.286 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.2900.025%
25500000.74947.271%
302500000.04695.491%
3510000000.00299.789%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025715.29


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computers5EAB44A3C2E8062E0.080


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:15:23alpertronManual testing
71730997923467418007
671CD35C34F573__no
2017-10-18T21:59:10Oliver KruseThreadripper
71730997923467418007
671CD35C34F573__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
102
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102
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105
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1010
TF factor-bounds graph:
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268
267
266
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258
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2100
Last modified: 2020-03-23T10:28:38+00:00