is 2 2401603 - 1
has 722955 decimal digits
takes 0.162 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LCB510257B7C786ACdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26712.372567.1642 %2000000600000000.50557.6158 %12.878069.6649 %
Target2630.664665.0794 %100007000000.00471.2750 %0.669265.5246 %
Difference+4+11.7080+2.0848 %+1990000+59300000+0.5008+6.3408%+12.2088+4.1403 %

Known prime factors (1 factor, 66.5 bits, 0.00276879% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24016031040159477449883982892166.49521655525027448
23 × 13 × 208226202187
2016-03-04132082262021876.14941,111.32,075.6

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2010-11-16JossManual testing2000020000--0.0020.616%
2011-01-01Oscar Östlin7501175011--0.0081.407%
2011-01-23Oscar Östlin9000018450006--0.0194.139%
2014-02-15mikrMSI31028224343950812--0.51910.242%
2018-09-28alpertronManual testing20000006000000012---10.525%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2004-04-29ANONYMOUSv4_computers212580.016
1999-03-15cmortonv4_computers212590.016
1999-04-13cmortonv4_computers212590.016
2016-02-23Mark RoseManual testing2592600.032
2009-01-15Sturle Sundegibus.ifi2602610.064
2012-06-03Sebastian HornbostelManual testing2612620.128
2013-01-23dbaughManual testing2622630.409
2015-02-27VictordeHollanderManual testing2632640.818
2015-02-27VictordeHollanderManual testing2642651.556
2015-10-21ramgeisManual testing2652663.112


ECM factoring results:
Total ECM effort:7.782 GHz-days
Estimated T-Level:21.489
DigitsB1CompleteFacMiss
20110003.1964.095%
25500000.29874.241%
302500000.01998.126%


ECM Summary

B1B2factorcurvesGHz-days
500005000000161.353
50000500000010.089
500007000000616.340


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15cmortonv4_computersCB510257B7C786AC0.162
1999-04-13cmortonv4_computersCB510257B7C786AC0.162


PRP results:
dateuseridcompidcofactorsres64
2017-09-30alpertronManual testing
104015947744988398289
D73371FD6C6ABFF7
2017-11-03Oliver KruseGTX-1
104015947744988398289
D73371FD6C6ABFF7


CERT results:
No CERT results for M2401603


P-1 factor-bounds graph:
B1 = 3102822, B2 = 43439508 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 3102822 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 90000, B2 = 1845000 (P-1 stage 2)
B1 = 90000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
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107
100
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1010
1011
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TF factor-bounds graph:
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265
264
263
262
261
260
259
258
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=21.49 ~= 55-bit
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Last modified: 2024-02-09T03:30:02+00:00