is 2 7879153 - 1
has 2371862 decimal digits
takes 1.803 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF709797F803B245Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual273242.772868.4932 %2500000040052471550731.860714.2269 %974.633672.9756 %
Target2673.771265.6716 %5500060000000.12572.5606 %3.896966.5507 %
Difference+6+239.0016+2.8215 %+24945000+40046471550+731.7350+11.6663%+970.7367+6.4249 %

Known prime factors:
No known factors for M7879153

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-12-02Mr. P-1v4_computers450006862504--0.0272.132%
2012-10-08NesowaWork10000019000006--0.0663.193%
2021-10-14Architects Cubeda3_cont41100023398000--0.5526.368%
2022-02-13Oliver Kruse11700K2500000040052471550--884.019.975%


Trial Factoring results:
5758596061626364656667686970717273
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-13ANONYMOUSv4_computers212630.125
2013-10-05NesowaManual testing2632640.249
2013-12-19David CampeauManual testing2642650.474
2015-06-09VictordeHollanderManual testing2652660.948
2016-08-31Gordon SpenceManual testing2662671.897
2018-08-05ramgeisManual testing2672683.794
2020-02-14TJAOIManual testing2682697.587
2021-08-22SRBaseManual testing26927015.17
2021-09-06SRBaseManual testing27027130.35
2021-10-13SRBaseManual testing27127260.70
2022-04-11RichD0Manual testing272273121.4


ECM factoring results:
Total ECM effort:2.088 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000062.088


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-16ANONYMOUSv4_computersF709797F803B245E1.803


PRP results:
No PRP results for M7879153


CERT results:
No CERT results for M7879153


P-1 factor-bounds graph:
B1 = 25000000, B2 = 40052471550 (P-1 stage 2)
B1 = 25000000 (P-1 stage 1)
B1 = 411000, B2 = 23398000 (P-1 stage 2)
B1 = 411000 (P-1 stage 1)
B1 = 100000, B2 = 1900000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 45000, B2 = 686250 (P-1 stage 2)
B1 = 45000 (P-1 stage 1)
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1010
1011
TF factor-bounds graph:
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271
270
269
268
267
266
265
264
263
this exponent TF target: 67
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
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Last modified: 2024-03-13T02:15:48+00:00