is 2 2294987 - 1
has 690860 decimal digits
takes 0.155 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L074FD50C3FFF7122double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26825.971867.6471%3000000900000000.75827.6829%26.729970.1327%2.4857%
PrimeNet2580.016762.0690%100001900000.00192.9268%0.018763.1791%1.1102%
GPU722620.267764.5161%120002000000.00221.7368%0.269965.1324%0.6163%
Difference+6+25.7041+3.1309%+2988000+89800000+0.7560+5.9461%+26.4601+5.0003%+5.0003%

Known prime factors (1 factor, 80.7 bits, 0.00351755% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
229498720013422898761754957352632580.727436024755233074413
32 × 7 × 23 × 1012699 × 297140863
2020-08-021012699297140863171,1991.67962.9618

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.229%
2010-11-07T12:40:00Jocelyn LaroucheManual testing1500015000---0.001--0.201%
2010-11-15T02:50:00Jocelyn LaroucheManual testing2000020000---0.002--0.258%
2010-12-03T10:57:00Oscar Östlin7501175011---0.007--0.679%
2011-01-17T09:04:00Oscar Östlin850001742500---0.017--2.235%
2014-06-11T02:10:00Jocelyn LaroucheManual testing112967112967---0.011--0.870%
2014-10-03T21:04:00Jocelyn LaroucheManual testing140934140934---0.014--0.986%
2016-01-16T00:34:37Jocelyn LaroucheManual testing43142643142606---0.063--3.578%
2019-11-18T19:07:25BigBrotherWinston30000009000000012---0.758--7.683%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:11Mark RoseManual testing21260--0.067--
2009-01-15T05:11:00Sturle Sundehummel.ifi260261--0.067--
2012-05-12T04:48:00Sebastian HornbostelManual testing261262--0.134--
2013-01-23T08:24:00dbaughManual testing262263--0.428--
2015-03-12T10:50:00VictordeHollanderManual testing263264--0.855--
2015-03-12T10:50:00VictordeHollanderManual testing264265--1.628--
2015-11-04T09:56:27ramgeisManual testing265266--3.256--
2017-05-27T13:18:45Gordon SpenceManual testing266267--6.512--
2019-04-22T13:11:36TJAOIManual testing267268--13.02--


ECM factoring results:

Old Calculation Method

Total ECM effort:7.608 GHz-days
Estimated T-Level:4.300
DigitsB1CurvesCompleteFacMiss
201100086 / 1000.86042.133%
255000086 / 2800.30773.514%

New Calculation Method

Total ECM effort:7.608 GHz-days
Estimated T-Level:4.300
DigitsB1CompleteFacMiss
20110002.7746.240%
25500000.25177.823%
302500000.01598.468%


ECM Summary

B1B2factorcurvesGHz-days
500005000000847.431
50000500000020.177


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00ANONYMOUSv4_computers074FD50C3FFF71220.155
2018-04-29T17:41:39kkmrkkblmbrbkold074FD50C3FFF71220.155


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-02T08:57:32ANONYMOUSdory
2001342289876175495735263
B9CCF0728A0DC6DAno
2020-08-02T19:46:44LOBESGoogleCloud
2001342289876175495735263
B9CCF0728A0DC6DAno


P-1 factor-bounds graph:
B1 = 3000000, B2 = 90000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 431426, B2 = 4314260 (P-1 stage 2)
B1 = 431426 (P-1 stage 1)
B1 = 85000, B2 = 1742500 (P-1 stage 2)
B1 = 140934 (P-1 stage 1)
B1 = 112967 (P-1 stage 1)
B1 = 85000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
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102
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109
TF factor-bounds graph:
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266
265
264
263
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261
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2100
Last modified: 2020-08-02T19:46:44+00:00