is 2 5078081 - 1
has 1528655 decimal digits
takes 0.704 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L8676EC08FC3E5AA7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272188.325868.0556 %30500095312500.16232.9670 %188.488169.0033 %
Target2651.436764.6154 %3400035000000.04482.4223 %1.481565.4725 %
Difference+7+186.8891+3.4402 %+271000+6031250+0.1175+0.5446%+187.0066+3.5308 %

Known prime factors (1 factor, 102.6 bits, 0.00202098% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5078081783202528771089843488239451088131102.627771159940901976399636240
24 × 34 × 5 × 7 × 19 × 48871 × 1438663 × 12726457
2021-11-061438663127264572.758e+100.41280.5885

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-08-17USAFSSP4_2600550009075006--0.0202.855%
2017-03-09Squeeky_Squirreli5-5250U_1600305000953125012--0.1626.043%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-11-06ATH5960X25000009250000027P-131102.6271.730


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-12-29Sturle Sundebruch.ifi2612620.060
2009-08-08GrunwalderGIMPManual testing212630.314
2016-02-23Mark RoseManual testing212630.254
2014-09-01krackerManual testing2632640.387
2014-09-15monstManual testing2642650.736
2015-08-02snme2pm1Manual testing2652661.472
2016-05-23Gordon SpenceManual testing2662672.943
2018-06-11ramgeisManual testing2672685.886
2021-01-11TJAOIManual testing26826911.77
2021-03-31ANONYMOUSManual testing26927170.64
2021-04-02ANONYMOUSManual testing27127294.18


ECM factoring results:
Total ECM effort:1.660 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.660


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-08-01ANONYMOUSv4_computers8676EC08FC3E5AA70.704


PRP results:
dateuseridcompidcofactorsres64
2021-11-06ATHec2-PRPCF
7832025287710898434882394510881
0613FADB994331C8


CERT results:
dateuseridcompid
2021-11-06irowikimydesk


P-1 factor-bounds graph:
B1 = 2500000, B2 = 92500000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 305000, B2 = 9531250 (P-1 stage 2)
B1 = 305000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 55000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
TF factor-bounds graph:
272
271
269
268
267
266
265
264
263
262
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
250
260
270
280
290
2100
2110
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Last modified: 2024-03-13T02:15:48+00:00