is 2 6928847 - 1
has 2085791 decimal digits
takes 1.511 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA7D5C0CB2DF0718Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272138.022068.0556%630000189000000.51393.9473%138.536069.3165%1.2609%
PrimeNet2630.230363.4921%280007000000.02043.1607%0.250864.6460%1.1539%
GPU722674.288465.6716%450009000000.02902.2368%4.317466.4395%0.7678%
Difference+5+133.7336+2.3839%+585000+18000000+0.4850+1.7105%+134.2186+2.8770%+0.4931%

Known prime factors:
No known factors for M6928847

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-31T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.234%
2002-02-17T00:00:00ANONYMOUSv4_computers2500087500---0.009--0.431%
2011-09-03T20:12:00Carsten Kossendeymother44000013310000---0.361--3.505%
2021-06-02T21:12:41Dylan DelgadoManual testing6300001890000012---0.514--3.947%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-14T00:00:00ANONYMOUSv4_computers21261--0.044--
1998-11-21T00:00:00ANONYMOUSv4_computers21262--0.089--
2005-02-18T00:00:00ANONYMOUSv4_computers21263--0.230--
2014-02-09T10:10:00NesowaManual testing263264--0.283--
2014-02-17T08:58:00lycornManual testing264265--0.539--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.078--
2016-04-03T19:14:47Gordon SpenceManual testing266267--2.157--
2018-02-25T11:47:50-Anonymous-Manual testing267268--4.314--
2020-05-01T08:51:06TJAOIManual testing268269--8.628--
2021-07-22T10:35:04takahashiManual testing269270--17.26--
2021-08-12T16:28:29SRBaseManual testing270271--34.51--
2021-09-25T07:02:27SRBaseManual testing271272--69.02--


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)
1999-07-30T00:00:00ANONYMOUSv4_computersA7D5C0CB2DF0718E1.511
2002-05-11T00:00:00ANONYMOUSv4_computersA7D5C0CB2DF0718E1.511


PRP results:
No PRP results for M6928847


P-1 factor-bounds graph:
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 = 30000 (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: 2021-09-25T07:02:27+00:00