is 2 1702819 - 1
has 512600 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-LABFBE3CEA483811Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.449868.6567%100000002000000001.38889.8038%18.838771.7295%3.0728%
PrimeNet2570.011363.1579%80001300000.00102.7322%0.012364.1645%1.0066%
GPU722610.180465.5738%70001000000.00081.3018%0.181266.0219%0.4481%
Difference+6+17.2694+3.0829%+9993000+199900000+1.3880+8.5020%+18.6574+5.7076%+5.7076%

Known prime factors (1 factor, 66.8 bits, 0.00392073% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17028191252049988660254073132166.76336764036244024
23 × 3 × 53 × 28902544217
2015-05-26532890254421713.962107.46200.70

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-01-27T22:35:00Jocelyn LaroucheManual testing5000050000---0.003--0.571%
2011-02-07T12:36:00Carsten Kossendeyleela900001507500---0.011--2.353%
2014-03-31T21:13:00Jocelyn LaroucheManual testing100000100000---0.007--0.883%
2014-04-26T14:29:00ANONYMOUSManual testing150000150000---0.010--1.108%
2014-10-03T21:04:00Jocelyn LaroucheManual testing187693187693---0.013--1.247%
2015-01-07T04:02:00Jocelyn LaroucheManual testing281539281539---0.019--1.524%
2015-02-13T17:59:00Jocelyn LaroucheManual testing374727374727---0.026--1.739%
2015-02-15T11:05:00VictordeHollanderManual testing10000000200000000---1.389--9.804%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-09T00:00:00ANONYMOUSv4_computers21258--0.023--
2010-04-23T13:38:00Architects Cubeda3_bu2260261--0.090--
2010-10-04T14:38:00GrunwalderGIMPManual testing21263--0.937--
2015-02-13T10:43:00VictordeHollanderManual testing263264--1.153--
2015-02-13T10:43:00VictordeHollanderManual testing264265--2.194--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.922 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.922 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024914.80
50000500000020.119


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computersABFBE3CEA483811B0.080


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T03:17:49Oliver KruseGTX-2
125204998866025407313
A1CB1D33237240__no
2017-11-03T14:18:59kkmrkkblmbrbkc4.xlarge
125204998866025407313
A1CB1D33237240__no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 374727 (P-1 stage 1)
B1 = 281539 (P-1 stage 1)
B1 = 187693 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 150000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
100
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102
103
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107
100
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1010
1011
TF factor-bounds graph:
267
265
264
263
261
258
257
250
260
270
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290
2100
Last modified: 2020-03-16T11:28:10+00:00