is 2 4999537 - 1
has 1505011 decimal digits
takes 0.693 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L2DF8B131A8611F2Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272191.284468.0556 %50000000250000000036.877511.4542 %228.161971.7145 %
Target2651.459364.6154 %3400035000000.04482.4160 %1.504165.4703 %
Difference+7+189.8252+3.4402 %+49966000+2496500000+36.8327+9.0382%+226.6579+6.2443 %

Known prime factors (1 factor, 77.3 bits, 0.00154546% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
49995371816899653168714513722092477.26618170679136575192
23 × 3 × 66883 × 11319941251
2021-10-2166883113199412516,933.2123.97231.52

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-09-16Carsten Kossendeymother25000362500--0.0091.887%
2011-07-10Squeeky_SquirrelT7500_2200600009900006--0.0222.957%
2011-12-09Squeeky_SquirrelT7500_220012000024300006--0.0494.072%
2017-02-08Squeeky_Squirreli5-5250U_1600300000937500012--0.1606.002%
2020-05-19timbitManual testing500000025000000012--3.68812.354%
2021-10-21timbitManual testing5000000025000000001222477.26636.8817.425%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-03-08Stephan Gruppv4_computers212610.031
2008-09-02Sturle Sundelara2612620.098
2011-08-27GrunwalderGIMPManual testing212630.319
2016-02-23Mark RoseManual testing2622630.196
2014-11-06lycornManual testing2632651.140
2015-07-31snme2pm1Manual testing2652661.495
2017-05-13YxinityManual testing2662672.989
2018-06-05ramgeisManual testing2672685.979
2020-12-28TJAOIManual testing26826911.96
2021-01-07YxinityManual testing26927023.92
2021-04-24ANONYMOUSManual testing27027147.83
2021-04-27ANONYMOUSManual testing27127295.66


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)
2000-04-12Stephan Gruppv4_computers2DF8B131A8611F2A0.693


PRP results:
dateuseridcompidcofactorsres64
2021-10-28kutenselaine1
181689965316871451372209
21641E946B413C3F


CERT results:
dateuseridcompid
2021-10-29C.D.B.i7-6850K


P-1 factor-bounds graph:
B1 = 50000000, B2 = 2500000000 (P-1 stage 2)
B1 = 50000000 (P-1 stage 1)
B1 = 5000000, B2 = 250000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 300000, B2 = 9375000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 120000, B2 = 2430000 (P-1 stage 2)
B1 = 120000 (P-1 stage 1)
B1 = 60000, B2 = 990000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 362500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
108
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
272
271
270
269
268
267
266
265
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00