is 2 2436557 - 1
has 733477 decimal digits
takes 0.165 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L697BBAE2B60B2044double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26948.998268.1159 %1988120695841800.55556.5918 %49.553770.2177 %
Target2630.655065.0794 %100007500000.00491.3061 %0.660065.5355 %
Difference+6+48.3431+3.0366 %+1978120+68834180+0.5506+5.2856%+48.8937+4.6822 %

Known prime factors (1 factor, 79.7 bits, 0.00326944% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24365579562806831349226721672792479.662196236058326343827
3 × 11 × 921157 × 6455519767
2021-11-19921157645551976750,24834.53864.347

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-14ANONYMOUSv4_computers2048204800--0.0010.657%
2003-10-31Team Prime Ribv4_computers15000217500--0.0031.656%
2010-11-17JossManual testing2000020000--0.0020.618%
2011-01-10Oscar Östlin9500019237506--0.0204.220%
2014-05-10mikrMSI19881206958418012--0.55610.764%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-15Michael Hanschov4_computers212590.016
2016-02-23Mark RoseManual testing2592600.032
2009-01-15Sturle Sundegouache.ifi2602610.063
2012-06-05Sebastian HornbostelManual testing2612620.126
2013-01-23dbaughManual testing2622630.403
2015-02-27VictordeHollanderManual testing2632640.806
2015-02-27VictordeHollanderManual testing2642651.533
2015-10-25ramgeisManual testing2652663.067
2017-07-08Gordon SpenceManual testing2662676.134
2019-06-03TJAOIManual testing26726812.27
2021-07-12TJAOIManual testing26826924.54


ECM factoring results:
Total ECM effort:10.508 GHz-days
Estimated T-Level:22.794
DigitsB1CompleteFacMiss
20110006.0380.239%
25500000.55957.194%
302500000.03596.537%
3510000000.00299.835%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001509.88
50000500000070.624


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23Michael Hanschov4_computers697BBAE2B60B20440.165
2018-05-23kkmrkkblmbrbkold697BBAE2B60B20440.165


PRP results:
dateuseridcompidcofactorsres64
2021-11-20Aaron Havilandflash
956280683134922672167279
38EB39917D5B198C


CERT results:
dateuseridcompid
2021-11-20shiroiro


P-1 factor-bounds graph:
B1 = 1988120, B2 = 69584180 (P-1 stage 2)
B1 = 1988120 (P-1 stage 1)
B1 = 95000, B2 = 1923750 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (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
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
269
268
267
266
265
264
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=22.79 ~= 59-bit
250
260
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280
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Last modified: 2024-02-29T14:28:04+00:00