is 2 1711519 - 1
has 515219 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-L0AA0637D7F0EA11Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271279.329870.4225%17115191882670900.81046.1571%280.140272.2436%1.8211%
PrimeNet2570.011263.1579%80001400000.00102.7907%0.012364.1860%1.0282%
GPU722610.179565.5738%70001000000.00081.3032%0.180366.0224%0.4486%
Difference+10+279.1503+4.8488%+1704519+188167090+0.8096+4.8539%+279.9599+6.2212%+6.2212%

Known prime factors (1 factor, 77.4 bits, 0.00452489% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17115192056264800300298983556732477.44460071340145809044
22 × 13 × 1155218079727097
2020-03-1513115521807972709734,7764,295,0298,021,917

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:42:00Carsten Kossendeyleela900001507500---0.011--1.430%
2014-04-01T22:35:00Jocelyn LaroucheManual testing100000100000---0.007--0.495%
2014-05-01T21:15:00Aaron HavilandManual testing150000027500000---0.199--4.374%
2018-02-04T03:38:00Jocelyn Larouchelow 4M15000001500000---0.102--1.975%
2018-02-11T11:28:52Jocelyn Larouchelow 4M17115192750000012---0.213--4.432%
2018-02-11T18:50:07Jocelyn Larouchelow 4M17115195500000012---0.315--5.044%
2018-02-27T12:51:01Jocelyn Larouchelow 4M171151911000000012---0.519--5.667%
2018-04-08T12:40:04Jocelyn Larouchelow 4M171151917115190012---0.747--6.070%
2018-10-16T21:51:19Jocelyn Larouchelow 4M171151918826709012---0.810--6.157%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:47Mark RoseManual testing258260--0.067--
2010-04-22T12:40:00Architects Cubeda3_bu2260261--0.090--
2016-02-23T16:28:47Mark RoseManual testing261262--0.179--
2010-10-16T22:16:00GrunwalderGIMPManual testing21263--0.933--
2016-02-23T16:28:47Mark RoseManual testing262263--0.574--
2011-09-29T05:53:00Sebastian HornbostelManual testing263264--1.147--
2011-09-29T05:53:00Sebastian HornbostelManual testing264265--2.183--
2014-01-18T11:21:00Never Odd Or EvenManual testing265266--4.366--
2014-01-18T11:21:00Never Odd Or EvenManual testing266267--8.732--
2014-01-18T11:21:00Never Odd Or EvenManual testing267268--17.46--
2014-01-18T11:21:00Never Odd Or EvenManual testing268269--34.93--
2014-01-18T11:21:00Never Odd Or EvenManual testing269270--69.86--
2015-11-11T09:24:58ramgeisManual testing270271--139.7--


ECM factoring results:

Old Calculation Method

Total ECM effort:16.536 GHz-days
Estimated T-Level:24.964
DigitsB1CurvesCompleteFacMiss
2011000278 / 1002.7806.118%
2550000278 / 2800.99336.986%

New Calculation Method

Total ECM effort:16.536 GHz-days
Estimated T-Level:24.964
DigitsB1CompleteFacMiss
20110008.9680.013%
25500000.81044.464%
302500000.05095.131%
3510000000.00299.772%


ECM Summary

B1B2factorcurvesGHz-days
50000500000027516.36
50000500000030.178


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computers0AA0637D7F0EA11D0.081
1999-05-16T00:00:00ANONYMOUSv4_computers0AA0637D7F0EA11D0.081
2015-07-19T18:02:00MadPooManual testing0AA0637D7F0EA11D0.081


PRP results:
dateuseridcompidcofactorsres64PRP
2020-03-15T13:23:44Christoph ZengerManual testing
205626480030029898355673
2D0D00A80C5CA05Ano
2020-03-16T16:56:23Massimo Cappelli (ik5pwa)maxlinux_8
205626480030029898355673
2D0D00A80C5CA05Ano


P-1 factor-bounds graph:
B1 = 1711519, B2 = 188267090 (P-1 stage 2)
B1 = 1711519, B2 = 171151900 (P-1 stage 2)
B1 = 1711519, B2 = 110000000 (P-1 stage 2)
B1 = 1711519, B2 = 55000000 (P-1 stage 2)
B1 = 1711519, B2 = 27500000 (P-1 stage 2)
B1 = 1500000, B2 = 27500000 (P-1 stage 2)
B1 = 1711519 (P-1 stage 1)
B1 = 1500000 (P-1 stage 1)
B1 = 90000, B2 = 1507500 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
TF factor-bounds graph:
271
270
269
268
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2020-03-23T10:28:47+00:00