is 2 2668249 - 1
has 803223 decimal digits
takes 0.206 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1F01EA078EC838CBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27089.553368.5714 %2000000054443613840334.313815.9528 %423.867273.5852 %
Target2630.598265.0794 %1300011000000.00811.6209 %0.606265.6454 %
Difference+7+88.9552+3.4921 %+19987000+54442513840+334.3058+14.3319%+423.2610+7.9398 %

Known prime factors:
No known factors for M2668249

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-11-08ANONYMOUSv4_computers2048204800--0.0010.673%
2003-11-28Team Prime Ribv4_computers15000213750--0.0031.677%
2010-11-19JossManual testing2000020000--0.0020.631%
2010-12-09markrtiny10500022837506--0.0284.500%
2014-11-10JossManual testing129055129055--0.0161.885%
2016-06-09JossManual testing15196045675006--0.0485.450%
2016-12-18JossManual testing182352182352---2.211%
2017-01-10JossManual testing218822218822---2.394%
2017-03-07JossManual testing31510331510306--0.0585.476%
2018-08-29JossManual testing630206630206---3.614%
2018-08-30JossManual testing6302061260412---4.534%
2018-09-03JossManual testing6302061890618---5.076%
2018-09-04JossManual testing6302062520824--0.0905.461%
2019-11-24masserManual testing20000005000000012--0.57010.345%
2022-12-15kurlybeans2000000054443613840--368.423.449%


Trial Factoring results:
5758596061626364656667686970
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-04-02ANONYMOUSv4_computers212590.014
2016-02-23Mark RoseManual testing2592600.029
2009-01-31Sturle Sundeghirardelli.ifi2602610.058
2012-05-21Grant McCrackenthumper2612620.115
2013-01-14dbaughManual testing2622630.368
2015-02-23VictordeHollanderManual testing2632652.136
2016-01-25ramgeisManual testing2652662.801
2017-09-10Gordon SpenceManual testing2662675.601
2019-04-29TJAOIManual testing26726811.20
2021-06-14TJAOIManual testing26826922.40
2024-02-02TJAOIManual testing26927044.81


ECM factoring results:
Total ECM effort:18.653 GHz-days
Estimated T-Level:22.871
DigitsB1CompleteFacMiss
20110006.1970.203%
25500000.57456.317%
302500000.03696.433%
3510000000.00299.830%


ECM Summary

B1B2factorcurvesGHz-days
50000500000012212.36
50000572145770.749
50000645000070.814
500006750000141.622
500003891478573.112


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23ANONYMOUSv4_computers1F01EA078EC838CB0.206
1999-04-23ANONYMOUSv4_computers1F01EA078EC838CB0.206
2018-07-23kkmrkkblmbrbkold1F01EA078EC838CB0.201


PRP results:
No PRP results for M2668249


CERT results:
No CERT results for M2668249


P-1 factor-bounds graph:
B1 = 20000000, B2 = 54443613840 (P-1 stage 2)
B1 = 20000000 (P-1 stage 1)
B1 = 2000000, B2 = 50000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 630206, B2 = 2520824 (P-1 stage 2)
B1 = 630206, B2 = 1890618 (P-1 stage 2)
B1 = 630206, B2 = 1260412 (P-1 stage 2)
B1 = 630206 (P-1 stage 1)
B1 = 315103, B2 = 3151030 (P-1 stage 2)
B1 = 151960, B2 = 4567500 (P-1 stage 2)
B1 = 315103 (P-1 stage 1)
B1 = 105000, B2 = 2283750 (P-1 stage 2)
B1 = 218822 (P-1 stage 1)
B1 = 182352 (P-1 stage 1)
B1 = 151960 (P-1 stage 1)
B1 = 129055 (P-1 stage 1)
B1 = 105000 (P-1 stage 1)
B1 = 15000, B2 = 213750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
108
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
270
269
268
267
266
265
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=22.87 ~= 59-bit
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260
270
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Last modified: 2024-03-13T02:15:48+00:00