is 2 6926207 - 1
has 2084997 decimal digits
takes 1.510 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LCBA2B78E7D8069F1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272138.074768.0556%20000002588493605.05696.9785%143.131670.2848%2.2292%
PrimeNet2630.230463.4921%280007000000.02043.1605%0.250964.6459%1.1538%
GPU722674.290165.6716%450009000000.02902.2366%4.319066.4394%0.7678%
Difference+5+133.7846+2.3839%+1955000+257949360+5.0280+4.7418%+138.8126+3.8453%+1.4614%

Known prime factors:
No known factors for M6926207

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-31T00:00:00ANONYMOUSv4_computers2500087500---0.009--0.431%
2011-06-05T15:33:00Carsten Kossendeyleela44000013310000---0.361--3.505%
2021-06-02T21:12:40Dylan DelgadoManual testing6300001890000012---0.514--3.947%
2021-12-06T08:50:49Seth_TrManual testing2000000258849360---5.057--6.978%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-05T00:00:00ANONYMOUSv4_computers21262--0.089--
2004-10-18T00:00:00ANONYMOUSv4_computers21263--0.230--
2014-02-09T10:10:00NesowaManual testing263264--0.283--
2014-02-17T08:57:00lycornManual testing264265--0.539--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.079--
2016-04-03T19:14:46Gordon SpenceManual testing266267--2.158--
2018-05-23T10:48:29ramgeisManual testing267268--4.316--
2020-05-01T08:51:07TJAOIManual testing268269--8.631--
2021-07-22T10:34:58takahashiManual testing269270--17.26--
2021-08-13T16:25:06SRBaseManual testing270271--34.53--
2021-09-25T07:18:54SRBaseManual testing271272--69.05--


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)
1999-07-26T00:00:00ANONYMOUSv4_computersCBA2B78E7D8069F11.510
2001-12-01T00:00:00ANONYMOUSv4_computersCBA2B78E7D8069F11.510


PRP results:
No PRP results for M6926207


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: 2021-12-06T08:50:49+00:00