is 2 5011381 - 1
has 1508577 decimal digits
takes 0.695 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9826CF37578CC14Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2675.929365.6716 %30000093750000.15974.9279 %6.089067.3633 %
Target2651.455864.6154 %3400035000000.04482.4169 %1.500665.4706 %
Difference+2+4.4735+1.0563 %+266000+5875000+0.1149+2.5109%+4.5883+1.8927 %

Known prime factors (1 factor, 71.6 bits, 0.00142941% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
501138136624290845500438962472271.633365411159573583
3 × 349 × 104639 × 3335351
2016-11-16104639333535197.9390.05640.0682

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2006-01-15Jossv4_computers20002000--0.0000.049%
2009-07-14USAFSSP4_2600550009075006--0.0202.849%
2014-11-10JossManual testing6780867808--0.0141.148%
2016-11-16Squeeky_Squirreli5-5250U_160030000093750001222271.6330.1606.004%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-05-23ANONYMOUSv4_computers212610.031
2016-02-23Mark RoseManual testing2612630.294
2014-08-29krackerManual testing2632640.392
2014-08-30lycornManual testing2642650.746
2015-07-23snme2pm1Manual testing2652661.491
2016-05-13Gordon SpenceManual testing2662672.982


ECM factoring results:
Total ECM effort:1.027 GHz-days
Estimated T-Level:1.154
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.027


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27Stephen Woodv4_computers9826CF37578CC14B0.695
2000-07-03ANONYMOUSv4_computers9826CF37578CC14B0.695


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
3662429084550043896247
11D5D63D8D10BA44
2018-04-28Oliver KruseGTX-3
3662429084550043896247
11D5D63D8D10BA44


CERT results:
No CERT results for M5011381


P-1 factor-bounds graph:
B1 = 300000, B2 = 9375000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 55000, B2 = 907500 (P-1 stage 2)
B1 = 67808 (P-1 stage 1)
B1 = 55000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
TF factor-bounds graph:
267
266
265
264
263
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=1.15 ~= -13-bit
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00