is 2 2648249 - 1
has 797203 decimal digits
takes 0.205 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LFFFC78BE1E75D9C0double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26711.220267.1642 %2000000600000000.57797.6924 %11.798169.6900 %
Target2630.602765.0794 %1300010000000.00751.5745 %0.610165.6292 %
Difference+4+10.6175+2.0848 %+1987000+59000000+0.5704+6.1179%+11.1879+4.0608 %

Known prime factors (1 factor, 73.5 bits, 0.00277541% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2648249133536572899309065659932373.5002521223889810004
22 × 630305972452501
2014-11-084630305972452501722.313,845,9087,183,085

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-31ANONYMOUSv4_computers2048204800--0.0010.672%
2009-06-22USAFSSP4_260030000420000--0.0062.404%
2011-01-17James Heinrichi7-92018000042750006--0.0455.492%
2019-07-04alpertronManual testing20000006000000012---10.621%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-26ANONYMOUSv4_computers212590.014
2022-03-11LordJuliusManual testing21260
2009-01-30Sturle Sundegolan.ifi2602610.058
2012-06-10markroldgamer2612620.116
2013-01-14dbaughManual testing2622630.371


ECM factoring results:
Total ECM effort:0.853 GHz-days
Estimated T-Level:1.923
DigitsB1CompleteFacMiss
20110000.38568.071%
25500000.03696.504%
302500000.00299.776%


ECM Summary

B1B2factorcurvesGHz-days
50000500000090.750
50000500000010.103


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23ANONYMOUSv4_computersFFFC78BE1E75D9C00.205


PRP results:
dateuseridcompidcofactorsres64
2017-10-19kkmrkkblmbrbkold
13353657289930906565993
547CA45052B44605
2017-11-14Oliver KruseThreadripper-PC
13353657289930906565993
547CA45052B44605


CERT results:
No CERT results for M2648249


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 180000, B2 = 4275000 (P-1 stage 2)
B1 = 180000 (P-1 stage 1)
B1 = 30000, B2 = 420000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=1.92 ~= -10-bit
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Last modified: 2024-02-29T14:28:04+00:00