is 2 6926039 - 1
has 2084946 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-L710761822E58BC7Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272138.078068.0556%20000002588493605.05696.9784%143.135070.2848%
Target2674.290265.6716%4500072000000.13752.2366%4.427766.4394%
Difference+5+133.7878+2.3839%+1955000+251649360+4.9195+4.7418%+138.7073+3.8453%

Known prime factors:
No known factors for M6926039

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-12-01ANONYMOUSv4_computers2500087500---0.009--0.431%
2011-06-20Carsten Kossendeyleela44000013310000---0.361--3.505%
2021-06-02Dylan DelgadoManual testing6300001890000012---0.514--3.947%
2021-12-07Seth_TrManual testing2000000258849360---5.057--6.978%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-07-21ANONYMOUSv4_computers21262--0.089--
2004-03-16Sturle Sundev4_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--4.316--
2020-05-01TJAOIManual testing268269--8.631--
2021-07-22takahashiManual testing269270--17.26--
2021-08-10SRBaseManual testing270271--34.53--
2021-09-28SRBaseManual 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)
1999-07-04ANONYMOUSv4_computers710761822E58BC7B1.510
2002-02-10ANONYMOUSv4_computers710761822E58BC7B1.510
2002-05-18ANONYMOUSv4_computers710761822E58BC7B1.510


PRP results:
No PRP results for M6926039


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)
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
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00