is 2 1720669 - 1
has 517973 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-L8096B72C1FE960D7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26834.640569.1176%17206691892735900.81477.9494%35.455371.5726%2.4550%
PrimeNet2570.011263.1579%80001400000.00102.7935%0.012264.1871%1.0292%
GPU722610.178565.5738%70001100000.00091.3438%0.179466.0364%0.4626%
Difference+7+34.4620+3.5439%+1713669+189163590+0.8139+6.6057%+35.2759+5.5362%+5.5362%

Known prime factors (2 factors, 171.0 bits, 0.00993587% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1720669225681991091953371785146632684.2226557972250675561999
3 × 2185990750225187333
2019-08-26321859907502251873333,478,9948.127e+91.518e+10
17206691293028739383249709779198632786.74137573430432676177399
3 × 797146681 × 15711633893
2020-04-067971466811571163389313,915,975109.85110.71

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
172066929181330044313025895452914617174809778869757844511
69
52170.963
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-08T15:59:00Carsten Kossendeyleela900001507500---0.011--2.086%
2014-04-04T00:13:00Jocelyn LaroucheManual testing100000100000---0.007--0.767%
2014-05-03T14:50:00Jocelyn LaroucheManual testing150000150000---0.010--0.969%
2014-10-06T21:12:00Jocelyn LaroucheManual testing187302187302---0.013--1.094%
2015-01-09T22:25:00Jocelyn LaroucheManual testing280953280953---0.019--1.345%
2015-02-12T12:33:00Jocelyn LaroucheManual testing373947373947---0.026--1.541%
2015-02-21T10:56:00David Campeaui5-2500k150000065000000---0.338--6.670%
2018-02-04T03:38:01Jocelyn Larouchelow 4M15000001500000---0.102--2.724%
2018-02-04T12:41:54Jocelyn Larouchelow 4M17206696500000012---0.353--6.757%
2018-03-15T11:41:47Jocelyn Larouchelow 4M172066913000000012---0.594--7.528%
2018-03-31T08:56:44Jocelyn Larouchelow 4M172066917206690012---0.751--7.842%
2018-10-17T22:59:47Jocelyn Larouchelow 4M172066918927359012---0.815--7.949%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-02-02T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:48Mark RoseManual testing258260--0.067--
2010-04-22T12:47:00Architects Cubedm1_76l260261--0.089--
2016-02-23T16:28:48Mark RoseManual testing261262--0.179--
2010-10-27T20:37:00GrunwalderGIMPManual testing21263--0.928--
2016-02-23T16:28:48Mark RoseManual testing262263--0.571--
2015-05-03T17:07:00snme2pm1Manual testing263264--1.141--
2015-05-03T17:07:00snme2pm1Manual testing264265--2.171--
2015-09-02T13:37:00ramgeisManual testing265266--4.343--
2018-05-07T13:42:46TJAOIManual testing266267--8.686--
2019-08-06T10:06:03TJAOIManual testing267268--17.37--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.939 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.939 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001307.737
500005000000241.428
500005000000975.773


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-07-04T19:27:00MadPooManual testing8096B72C1FE960D70.081


PRP results:
dateuseridcompidcofactorsres64PRP
2019-08-27T13:32:04Niels_Mache_NextcloudSuperDry-X
22568199109195337178514663
2297799B7E97F1F9no
2019-08-28T11:44:53marssystemsSYSTEM01
22568199109195337178514663
2297799B7E97F1F9no
2020-04-06T11:05:09ATHec2-PRPCF
22568199109195337178514663
129302873938324970977919863
2297799B7E97F1F9no


P-1 factor-bounds graph:
B1 = 1720669, B2 = 189273590 (P-1 stage 2)
B1 = 1720669, B2 = 172066900 (P-1 stage 2)
B1 = 1720669, B2 = 130000000 (P-1 stage 2)
B1 = 1720669, B2 = 65000000 (P-1 stage 2)
B1 = 1500000, B2 = 65000000 (P-1 stage 2)
B1 = 1720669 (P-1 stage 1)
B1 = 1500000 (P-1 stage 1)
B1 = 373947 (P-1 stage 1)
B1 = 280953 (P-1 stage 1)
B1 = 187302 (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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TF factor-bounds graph:
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Last modified: 2020-04-06T11:05:09+00:00