is 2 978883 - 1
has 294674 decimal digits
takes 0.024 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L456D2EDE71F23C25double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26730.354970.1493 %830000249000000.07535.4742 %30.430271.7833 %
Target2440.000054.5455 %1600032500000.006818.4355 %0.006862.9252 %
Difference+23+30.3549+15.6038 %+814000+21650000+0.0685-12.9613 %+30.4235+8.8581 %

Known prime factors (1 factor, 79.3 bits, 0.00809873% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
9788837324356638983030080322732479.277374118083518818392
23 × 13 × 61 × 58971955157443
2014-01-086158971955157443125,074112,976211,007

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-08ANONYMOUSv4_computers2000200000--0.00012.299%
2002-03-03ANONYMOUSv4_computers4096409600--0.00115.228%
2002-05-05ANONYMOUSv4_computers8192819200--0.00218.030%
2002-08-03ANONYMOUSv4_computers32768327680012--0.00723.514%
2003-01-25ANONYMOUSv4_computers65536655360012--0.01526.180%
2003-09-14ANONYMOUSv4_computers1310721310720012--0.02928.787%
2011-06-01JossManual testing200000200000--0.00715.674%
2011-06-16JossManual testing400000400000--0.01417.836%
2012-02-06JossManual testing683090683090--0.02419.503%
2013-10-11David Campeaui5-2500k8300002490000012--0.07531.840%
2016-03-17alpertronManual testing20000050000006---26.362%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-07-03ANONYMOUSv4_computers212550.005
2000-10-28ANONYMOUSv4_computers212560.010
2001-11-24ANONYMOUSv4_computers212570.020
2003-08-31ANONYMOUSv4_computers212580.039
2022-03-07LordJuliusManual testing258260
2010-04-02Architects CubedManual testing2602610.157
2013-12-15lycornsnail2612620.314


ECM factoring results:
Total ECM effort:14.095 GHz-days
Estimated T-Level:25.651
DigitsB1CompleteFacMiss
201100014.5770.000%
25500001.59820.223%
302500000.13087.796%
3510000000.00999.136%


ECM Summary

B1B2factorcurvesGHz-days
10.170
5000050000002757.684
25000025000000446.241


Lucas-Lehmer results:
No L-L results for M978883


PRP results:
dateuseridcompidcofactorsres64
2017-09-28Oliver KruseGTX-2
732435663898303008032273
172CB9463AB91A1A
2017-10-15kkmrkkblmbrbkc4.xlarge
732435663898303008032273
172CB9463AB91A1A
2020-04-25Oliver KruseAddPrpType5
732435663898303008032273
60238670997AD953


CERT results:
No CERT results for M978883


P-1 factor-bounds graph:
B1 = 830000, B2 = 24900000 (P-1 stage 2)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 830000 (P-1 stage 1)
B1 = 683090 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 131072 (P-1 stage 1)
B1 = 65536 (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 = 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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261
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255
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=25.65 ~= 69-bit
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Last modified: 2024-03-03T02:29:32+00:00