is 2 6926743 - 1
has 2085158 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-LA078F49034713875double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.064068.0556%20000002588493605.05696.9785%143.120970.2848%
Target2674.289765.6716%450009000000.02902.2366%4.318766.4394%
Difference+5+133.7742+2.3839%+1955000+257949360+5.0280+4.7419%+138.8022+3.8454%

Known prime factors:
No known factors for M6926743

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-08-31ANONYMOUSv4_computers3000030000---0.009--0.234%
2002-02-17ANONYMOUSv4_computers3000030000---0.009--0.234%
2011-09-03Carsten Kossendeymother44000013420000---0.363--3.511%
2021-06-02Dylan DelgadoManual testing6300001890000012---0.514--3.947%
2021-12-07Seth_TrManual testing2000000258849360---5.057--6.979%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-11ANONYMOUSv4_computers21262--0.089--
2002-02-17ANONYMOUSv4_computers21263--0.230--
2014-02-09NesowaManual testing263264--0.283--
2014-02-17lycornManual testing264265--0.539--
2015-06-26VictordeHollanderManual testing265266--1.079--
2016-04-03Gordon SpenceManual testing266267--2.158--
2018-05-23ramgeisManual testing267268--4.315--
2020-05-01TJAOIManual testing268269--8.631--
2021-07-22takahashiManual testing269270--17.26--
2021-08-10SRBaseManual testing270271--34.52--
2021-09-25SRBaseManual testing271272--69.04--


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)
1999-07-26ANONYMOUSv4_computersA078F490347138751.510
2002-02-17ANONYMOUSv4_computersA078F490347138751.510


PRP results:
No PRP results for M6926743


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 = 13420000 (P-1 stage 2)
B1 = 630000 (P-1 stage 1)
B1 = 440000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
262
this exponent TF target: 67
TF double-checked to: 67.8
ECM T-Level=1.15 ~= -13-bit
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280
Last modified: 2023-04-26T21:34:10+00:00