is 2 2949887 - 1
has 888005 decimal digits
takes 0.251 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC6E31A43CC9D3F70double-checked
PRPEE0F376A29451A4Fverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26820.205867.6471%1000000200000000.25125.5437%20.457069.4406%1.7935%
PrimeNet2590.026062.7119%130002600000.00333.0736%0.029363.8580%1.1461%
GPU722630.541065.0794%170003200000.00411.9821%0.545265.7715%0.6921%
Difference+5+19.6648+2.5677%+983000+19680000+0.2470+3.5616%+19.9118+3.6691%+3.6691%

Known prime factors (1 factor, 72.4 bits, 0.00245593% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
294988764388945073639744644812272.4471091379857493520
24 × 5 × 7 × 1948892602667
2020-08-21161948892602667609.1413,10424,474

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.246%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.146%
2010-11-03T15:11:00markrtiny950001971250---0.024--2.449%
2014-11-10T23:29:00Jocelyn LaroucheManual testing116758116758---0.014--0.928%
2015-01-26T12:23:00Jocelyn LaroucheManual testing141276141276---0.017--1.032%
2015-01-30T21:42:00Jocelyn LaroucheManual testing170943170943---0.021--1.144%
2015-02-01T13:32:00Jocelyn LaroucheManual testing188037188037---0.023--1.202%
2015-02-03T07:46:00Jocelyn LaroucheManual testing206840206840---0.026--1.262%
2015-02-11T12:22:00Jocelyn LaroucheManual testing366427366427---0.045--1.661%
2015-02-15T21:12:00Jocelyn LaroucheManual testing403069403069---0.050--1.734%
2015-02-23T15:50:00Jocelyn LaroucheManual testing443375443375---0.055--1.809%
2015-02-27T19:06:00Jocelyn LaroucheManual testing487712487712---0.060--1.886%
2015-03-10T07:55:00Jocelyn LaroucheManual testing536483536483---0.066--1.964%
2015-03-14T11:30:00Jocelyn LaroucheManual testing590131590131---0.073--2.044%
2015-03-29T20:50:00Jocelyn LaroucheManual testing714058714058---0.088--2.210%
2015-04-08T16:59:00Jocelyn LaroucheManual testing785463785463---0.097--2.296%
2015-04-30T21:53:00VictordeHollanderManual testing100000020000000---0.251--5.544%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:25Mark RoseManual testing21260--0.052--
2009-02-14T15:52:00Sturle Sundebach.ifi260261--0.052--
2011-12-14T05:25:00Sebastian HornbostelManual testing261262--0.104--
2013-01-07T13:49:00dbaughManual testing262263--0.333--
2015-04-27T09:54:00VictordeHollanderManual testing263264--0.666--
2015-04-27T09:54:00VictordeHollanderManual testing264265--1.267--
2016-02-25T09:22:06ramgeisManual testing265266--2.533--
2017-11-28T10:01:36Gordon SpenceManual testing266267--5.066--
2018-12-24T00:53:32chuenkitManual testing267268--10.13--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.084 GHz-days
Estimated T-Level:0.900
DigitsB1CurvesCompleteFacMiss
201100018 / 1000.18083.451%
255000018 / 2800.06493.763%

New Calculation Method

Total ECM effort:2.084 GHz-days
Estimated T-Level:0.900
DigitsB1CompleteFacMiss
20110000.58155.954%
25500000.05294.888%
302500000.00399.677%


ECM Summary

B1B2factorcurvesGHz-days
500005000000151.737
50000500000030.347


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-26T00:00:00ANONYMOUSv4_computersC6E31A43CC9D3F700.251
2018-10-12T13:02:59kkmrkkblmbrbkoldC6E31A43CC9D3F700.251


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-21T17:12:19mognutsStrand
6438894507363974464481
EE0F376A29451A4Fno


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 785463 (P-1 stage 1)
B1 = 714058 (P-1 stage 1)
B1 = 590131 (P-1 stage 1)
B1 = 536483 (P-1 stage 1)
B1 = 487712 (P-1 stage 1)
B1 = 443375 (P-1 stage 1)
B1 = 403069 (P-1 stage 1)
B1 = 366427 (P-1 stage 1)
B1 = 206840 (P-1 stage 1)
B1 = 95000, B2 = 1971250 (P-1 stage 2)
B1 = 188037 (P-1 stage 1)
B1 = 170943 (P-1 stage 1)
B1 = 141276 (P-1 stage 1)
B1 = 116758 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-08-21T17:12:19+00:00