is 2 1722607 - 1
has 518557 decimal digits
takes 0.081 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L800B0F0C5CB905F5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26717.249468.6567%36422001234567890.69408.6225%17.943471.3593%2.7026%
PrimeNet2570.011163.1579%80001400000.00102.7941%0.012264.1873%1.0294%
GPU722610.178365.5738%70001100000.00091.3441%0.179266.0365%0.4627%
Difference+6+17.0711+3.0829%+3635200+123346789+0.6931+7.2784%+17.7642+5.3228%+5.3228%

Known prime factors (1 factor, 86.9 bits, 0.00504190% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17226071396683326242049763770376012786.85240539813382914668400
24 × 3 × 52 × 2657 × 181603 × 70014167
2015-08-241816037001416714,177,9710.27200.4862

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T15:59:00Carsten Kossendeyleela900001507500---0.011--2.357%
2014-04-04T00:13:00Jocelyn LaroucheManual testing100000100000---0.007--0.885%
2014-05-04T12:46:00Jocelyn LaroucheManual testing150000150000---0.010--1.111%
2014-10-07T22:12:00Jocelyn LaroucheManual testing187260187260---0.013--1.248%
2015-01-09T22:25:00Jocelyn LaroucheManual testing280890280890---0.019--1.525%
2015-02-11T12:22:00Jocelyn LaroucheManual testing373863373863---0.026--1.741%
2015-02-22T09:50:00Jocelyn LaroucheManual testing411249411249---0.028--1.816%
2015-03-06T12:09:00Jocelyn LaroucheManual testing452373452373---0.031--1.894%
2015-03-14T11:30:00Jocelyn LaroucheManual testing497610497610---0.034--1.973%
2015-04-08T16:59:00Jocelyn LaroucheManual testing602108602108---0.041--2.137%
2015-05-01T17:20:00Jocelyn LaroucheManual testing728549728549---0.050--2.309%
2015-05-07T16:18:00Jocelyn LaroucheManual testing801403801403---0.055--2.397%
2015-05-22T00:28:00Jocelyn LaroucheManual testing881543881543---0.060--2.487%
2015-05-26T18:16:00Jocelyn LaroucheManual testing969697969697---0.066--2.580%
2015-06-08T13:43:00Jocelyn LaroucheManual testing10666661066666---0.073--2.674%
2015-06-25T21:15:00Jocelyn LaroucheManual testing11733321173332---0.080--2.770%
2015-07-07T18:13:00Jocelyn LaroucheManual testing12906651290665---0.088--2.867%
2015-07-21T01:19:00Jocelyn LaroucheManual testing14197311419731---0.097--2.967%
2015-07-24T22:03:00Jocelyn LaroucheManual testing15617041561704---0.107--3.068%
2015-08-24T03:41:00mikrMSI3642200123456789122786.8520.6940.1621.3888.623%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-21T00:00:00ANONYMOUSv4_computers21257--0.011--
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2010-04-24T12:42:00Architects Cubedm1_76l260261--0.089--
2010-10-27T20:37:00GrunwalderGIMPManual testing21263--0.927--
2015-05-03T20:03:00snme2pm1Manual testing263264--1.140--
2015-05-03T20:03:00snme2pm1Manual testing264265--2.169--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.940 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.940 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025114.94


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers800B0F0C5CB905F50.081
2015-07-18T19:04:00MadPooManual testing800B0F0C5CB905F50.081


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T04:05:56Oliver KruseGTX-3
139668332624204976377037601
97A57E72098C3A__no
2017-11-03T15:12:58ATHec2-1xf
139668332624204976377037601
97A57E72098C3A__no


P-1 factor-bounds graph:
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 1561704 (P-1 stage 1)
B1 = 1419731 (P-1 stage 1)
B1 = 1290665 (P-1 stage 1)
B1 = 1173332 (P-1 stage 1)
B1 = 1066666 (P-1 stage 1)
B1 = 969697 (P-1 stage 1)
B1 = 881543 (P-1 stage 1)
B1 = 801403 (P-1 stage 1)
B1 = 728549 (P-1 stage 1)
B1 = 602108 (P-1 stage 1)
B1 = 497610 (P-1 stage 1)
B1 = 452373 (P-1 stage 1)
B1 = 411249 (P-1 stage 1)
B1 = 373863 (P-1 stage 1)
B1 = 280890 (P-1 stage 1)
B1 = 187260 (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)
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106
107
103
104
105
106
107
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109
TF factor-bounds graph:
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264
263
261
258
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2100
Last modified: 2020-04-13T10:22:37+00:00