is 2 1995727 - 1
has 600774 decimal digits
takes 0.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L14215D469791D9E4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual271239.551070.4225 %19957272494658751.47576.6356 %241.026672.3852 %
Target2620.307866.1290 %80005500000.00361.2361 %0.311466.5477 %
Difference+9+239.2431+4.2935 %+1987727+248915875+1.4721+5.3995%+240.7152+5.8375 %

Known prime factors (1 factor, 74.9 bits, 0.00375511% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1995727362860140658669744774792374.9429090926280464957
53 × 171526910952169
2020-04-24531715269109521691,917.0890,9541,664,053

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-03-03kurlyhex10000003000000012--0.2469.659%
2018-01-28JossManual testing10000001000000---4.515%
2018-01-29JossManual testing19957273000000012--0.33610.055%
2018-02-16JossManual testing19957276000000012--0.49211.175%
2018-03-09JossManual testing199572712000000012--0.80312.283%
2018-05-14JossManual testing199572719957270012--1.21713.088%
2018-11-26JossManual testing199572724946587512--1.47613.439%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-12-27twmossv4_computers212580.019
2016-02-23Mark RoseManual testing2582600.058
2009-12-07S485122USB-W2602610.077
2011-05-03XyzzyManual testing2612620.154
2011-05-03XyzzyManual testing2622630.492
2011-05-03XyzzyManual testing2632640.984
2011-05-03XyzzyManual testing2642651.872
2014-01-04Never Odd Or EvenManual testing2652663.744
2014-01-04Never Odd Or EvenManual testing2662677.489
2014-01-04Never Odd Or EvenManual testing26726814.98
2014-01-04Never Odd Or EvenManual testing26826929.96
2014-01-04Never Odd Or EvenManual testing26927059.91
2015-10-17ramgeisManual testing270271119.8


ECM factoring results:
Total ECM effort:23.005 GHz-days
Estimated T-Level:24.775
DigitsB1CompleteFacMiss
201100010.1570.004%
25500000.95538.478%
302500000.06194.108%
3510000000.00399.715%


ECM Summary

B1B2factorcurvesGHz-days
500005000000936.973
50000500000010.073
50000750000015715.96


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-10twmossv4_computers14215D469791D9E40.131
2015-06-27MadPooManual testing14215D469791D9E40.131


PRP results:
dateuseridcompidcofactorsres64
2020-04-25M Millercruncher
36286014065866974477479
2DFF74BFDB6631FC
2020-04-25atrenchDesktop
36286014065866974477479
2DFF74BFDB6631FC
2020-04-26marssystemssystem11
36286014065866974477479
2DFF74BFDB6631FC


CERT results:
No CERT results for M1995727


P-1 factor-bounds graph:
B1 = 1995727, B2 = 249465875 (P-1 stage 2)
B1 = 1995727, B2 = 199572700 (P-1 stage 2)
B1 = 1995727, B2 = 120000000 (P-1 stage 2)
B1 = 1995727, B2 = 60000000 (P-1 stage 2)
B1 = 1995727, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1995727 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=24.78 ~= 66-bit
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Last modified: 2024-02-29T14:28:04+00:00