is 2 6921779 - 1
has 2083664 decimal digits
takes 1.509 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L55F3007846CA0FB2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual272138.163068.0556%40000004143239108.33317.9715%146.496170.6020%2.5464%
PrimeNet2630.230663.4921%280007000000.02043.1602%0.251064.6458%1.1537%
GPU722674.292865.6716%450009000000.02902.2364%4.321866.4394%0.7677%
Difference+5+133.8702+2.3839%+3955000+413423910+8.3042+5.7351%+142.1743+4.1627%+1.7787%

Known prime factors:
No known factors for M6921779

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-12-01T00:00:00ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-09-03T20:13:00Carsten Kossendeymother44000013420000---0.363--3.510%
2021-06-02T21:12:49Dylan DelgadoManual testing6300001890000012---0.514--3.947%
2021-11-26T09:13:03Seth_TrManual testing400000011000000012---3.091--6.531%
2021-12-02T10:09:45Seth_TrManual testing4000000414323910---8.333--7.971%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21T00:00:00ANONYMOUSv4_computers21261--0.044--
1998-08-16T00:00:00ANONYMOUSv4_computers21262--0.089--
2005-02-12T00:00:00ANONYMOUSv4_computers21263--0.231--
2014-02-09T10:09:00NesowaManual testing263264--0.284--
2014-02-17T01:16:00lycornManual testing264265--0.540--
2015-06-26T13:39:00VictordeHollanderManual testing265266--1.080--
2016-04-02T19:16:01Gordon SpenceManual testing266267--2.159--
2018-02-27T00:21:36-Anonymous-Manual testing267268--4.318--
2020-01-03T13:25:31mnd9Manual testing268269--8.637--
2021-07-18T22:43:07takahashiManual testing269270--17.27--
2021-08-10T15:17:03SRBaseManual testing270271--34.55--
2021-09-25T07:19:25SRBaseManual testing271272--69.09--


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)
1999-03-26T00:00:00ANONYMOUSv4_computers7BD8937007E297__1.509
1999-07-04T00:00:00ANONYMOUSv4_computers55F3007846CA0FB21.509
2002-01-28T00:00:00ANONYMOUSv4_computers55F3007846CA0FB21.509


PRP results:
No PRP results for M6921779


P-1 factor-bounds graph:
B1 = 4000000, B2 = 414323910 (P-1 stage 2)
B1 = 4000000, B2 = 110000000 (P-1 stage 2)
B1 = 4000000 (P-1 stage 1)
B1 = 630000, B2 = 18900000 (P-1 stage 2)
B1 = 440000, B2 = 13420000 (P-1 stage 2)
B1 = 630000 (P-1 stage 1)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-12-02T10:09:45+00:00