is 2 832747 - 1
has 250682 decimal digits
takes 0.017 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L690674D1DE6DF58Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26735.681870.1493 %81297703577098800.78709.9005 %36.468873.1046 %
Target2440.000054.5455 %1400027500000.004717.5293 %0.004762.5133 %
Difference+23+35.6818+15.6038 %+8115770+354959880+0.7823-7.6289 %+36.4641+10.5913 %

Known prime factors (1 factor, 79.5 bits, 0.00954245% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
8327478340460284672866157247272479.464500779965864354129
33 × 18547406143124227
2014-06-052718547406143124227214,13929,264,20054,657,377

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-08ANONYMOUSv4_computers2000200000--0.00011.998%
2002-02-10ANONYMOUSv4_computers4096409600--0.00114.913%
2002-04-07ANONYMOUSv4_computers8192819200--0.00217.705%
2002-05-18ANONYMOUSv4_computers163841638400--0.00320.462%
2002-06-09ANONYMOUSv4_computers32768327680012--0.00623.174%
2002-12-09ANONYMOUSv4_computers65537655370012--0.01225.836%
2003-07-30ANONYMOUSv4_computers1310721310720012--0.02428.439%
2008-12-01markrManual testing12000003600000012--0.09332.742%
2014-04-11mikrBA6812977035770988012--0.78740.073%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-08-01ANONYMOUSv4_computers212550.006
2001-01-28ANONYMOUSv4_computers212560.012
2001-10-20ANONYMOUSv4_computers212570.023
2003-09-09ANONYMOUSv4_computers212580.046
2008-10-11Sturle Sundenikabrik.ifi2582600.138
2010-05-26Architects Cubedm1_f22602610.184


ECM factoring results:
Total ECM effort:11.393 GHz-days
Estimated T-Level:25.644
DigitsB1CompleteFacMiss
201100014.3460.000%
25500001.57720.659%
302500000.12987.914%
3510000000.00999.142%


ECM Summary

B1B2factorcurvesGHz-days
10.275
5000050000002696.071
25000025000000445.046


Lucas-Lehmer results:
No L-L results for M832747


PRP results:
dateuseridcompidcofactorsres64
2017-09-28Oliver KruseGTX-0
834046028467286615724727
20E146A830094B00
2017-10-14Oliver KruseGTX-2
834046028467286615724727
20E146A830094B00
2017-12-18ATHec2-1xh
834046028467286615724727
20E146A830094B00
2020-04-21Oliver KruseAddPrpType5
834046028467286615724727
6468F76713122C90


CERT results:
No CERT results for M832747


P-1 factor-bounds graph:
B1 = 8129770, B2 = 357709880 (P-1 stage 2)
B1 = 8129770 (P-1 stage 1)
B1 = 1200000, B2 = 36000000 (P-1 stage 2)
B1 = 1200000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 65537, B2 = 6553700 (P-1 stage 2)
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)
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TF factor-bounds graph:
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this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=25.64 ~= 69-bit
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Last modified: 2024-03-13T02:15:48+00:00