is 2 784387 - 1
has 236125 decimal digits
takes 0.016 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA03B8A5920487D5Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26737.881770.1493 %1630000554200000.13216.5676 %38.013872.1097 %
Target2440.000054.5455 %1300025000000.004317.0809 %0.004362.3095 %
Difference+23+37.8817+15.6038 %+1617000+52920000+0.1278-10.5133 %+38.0095+9.8002 %

Known prime factors (1 factor, 62.4 bits, 0.00795350% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
78438760274434121187363271962.3863842136223649
29023 × 132382463
2014-04-19290231323824630.78320.20970.3901

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-02ANONYMOUSv4_computers2000200000--0.00011.888%
2002-02-03ANONYMOUSv4_computers4096409600--0.00114.798%
2002-03-31ANONYMOUSv4_computers8192819200--0.00217.586%
2002-05-18ANONYMOUSv4_computers163841638400--0.00320.339%
2002-07-27ANONYMOUSv4_computers32768327680012--0.00623.049%
2002-12-09ANONYMOUSv4_computers65537655370012--0.01225.709%
2003-07-21ANONYMOUSv4_computers1310721310720012--0.02428.311%
2011-07-10JossManual testing273107273107--0.00816.284%
2011-08-28JossManual testing455178455178--0.01317.870%
2012-01-09JossManual testing910357910357--0.02620.016%
2012-07-21JossManual testing15687741568774--0.04521.689%
2013-10-30David Campeaui5-2500k16300005542000012--0.13234.018%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-10-07ANONYMOUSv4_computers212550.006
2001-02-18ANONYMOUSv4_computers212560.012
2001-12-08ANONYMOUSv4_computers212570.024
2003-09-21ANONYMOUSv4_computers212580.049
2008-10-10Sturle Sundepapageno.ifi2582590.049
2008-10-10Sturle Sundepapageno.ifi2592600.098
2010-06-17Architects Cubedm1_f22602610.196


ECM factoring results:
Total ECM effort:11.315 GHz-days
Estimated T-Level:25.643
DigitsB1CompleteFacMiss
201100014.3080.000%
25500001.57320.733%
302500000.12987.934%
3510000000.00999.143%


ECM Summary

B1B2factorcurvesGHz-days
10.296
5000050000002686.003
25000025000000445.016


Lucas-Lehmer results:
No L-L results for M784387


PRP results:
dateuseridcompidcofactorsres64
2017-09-28Oliver KruseGTX-2
6027443412118736327
7708371F1B7FA9F1
2017-10-13Oliver KruseGTX-3
6027443412118736327
7708371F1B7FA9F1
2017-12-18ATHec2-1xh
6027443412118736327
7708371F1B7FA9F1
2020-04-21Oliver KruseAddPrpType5
6027443412118736327
61A9543131AE133F


CERT results:
No CERT results for M784387


P-1 factor-bounds graph:
B1 = 1630000, B2 = 55420000 (P-1 stage 2)
B1 = 1630000 (P-1 stage 1)
B1 = 1568774 (P-1 stage 1)
B1 = 910357 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 455178 (P-1 stage 1)
B1 = 65537, B2 = 6553700 (P-1 stage 2)
B1 = 273107 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 65537 (P-1 stage 1)
B1 = 8192, B2 = 819200 (P-1 stage 2)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 8192 (P-1 stage 1)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
TF factor-bounds graph:
261
260
259
258
257
256
255
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=25.64 ~= 69-bit
250
260
270
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Last modified: 2024-03-03T02:29:32+00:00