is 2 6939827 - 1
has 2089097 decimal digits
takes 1.513 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L52A6D521EEFD4215double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272137.803768.0556%20000002588493605.05696.9799%142.860670.2852%2.2297%
PrimeNet2630.230063.4921%280007000000.02043.1615%0.250464.6463%1.1542%
GPU722674.281765.6716%450009000000.02902.2373%4.310666.4397%0.7680%
Difference+5+133.5220+2.3839%+1955000+257949360+5.0280+4.7425%+138.5500+3.8455%+1.4616%

Known prime factors:
No known factors for M6939827

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-09-10T00:00:00ANONYMOUSv4_computers2500087500---0.009--0.431%
2011-09-03T20:13:00Carsten Kossendeymother44000013310000---0.361--3.506%
2021-06-02T21:12:48Dylan DelgadoManual testing6300001890000012---0.514--3.948%
2021-12-06T19:16:51Seth_TrManual testing2000000258849360---5.057--6.980%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00mhoneyv4_computers21262--0.089--
2005-03-06T00:00:00ANONYMOUSv4_computers21263--0.230--
2014-02-09T10:11:00NesowaManual testing263264--0.283--
2014-02-16T23:06:00lycornManual testing264265--0.538--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.077--
2016-04-05T22:46:23Gordon SpenceManual testing266267--2.154--
2018-02-27T00:21:33-Anonymous-Manual testing267268--4.307--
2020-04-24T07:21:04TJAOIManual testing268269--8.614--
2021-07-25T22:34:58takahashiManual testing269270--17.23--
2021-08-12T16:25:07SRBaseManual testing270271--34.46--
2021-09-25T07:02:31SRBaseManual testing271272--68.91--


ECM factoring results:
Total ECM effort:1.989 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.989


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-07T00:00:00MadPoov4_computers52A6D521EEFD42151.513
2001-11-03T00:00:00ANONYMOUSv4_computers52A6D521EEFD42151.513


PRP results:
No PRP results for M6939827


P-1 factor-bounds graph:
B1 = 2000000, B2 = 258849360 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 630000, B2 = 18900000 (P-1 stage 2)
B1 = 440000, B2 = 13310000 (P-1 stage 2)
B1 = 630000 (P-1 stage 1)
B1 = 440000 (P-1 stage 1)
B1 = 25000, B2 = 87500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-06T19:16:51+00:00