is 2 1304981 - 1
has 392839 decimal digits
takes 0.041 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L592871F19FC2D27Ddouble-checked
PRP1E4CEF0C79ABC57DPRP-tested

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26845.674969.1176 %23800000122251996020307.136218.3467 %352.811174.7835 %
Target2600.117765.0000 %55001800000.00070.9358 %0.118465.3275 %
Difference+8+45.5572+4.1176 %+23794500+122251816020+307.1355+17.4109%+352.6927+9.4560 %

Known prime factors:
No known factors for M1304981

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-09-21Team Prime Ribv4_computers1000010000006--0.0032.930%
2003-09-21Xyzzyv4_computers1000010000006--0.0032.930%
2013-11-11David Campeaui5-2500k11900003451000012--0.13811.254%
2016-08-09Bruno Victal5820K.ECM25000006250000012--0.26512.712%
2016-08-27Bruno VictalManual testing25000006250000012---12.712%
2018-05-15JossManual testing130498113049810012--0.38313.513%
2018-10-13JossManual testing130498114354791012--0.41613.669%
2022-11-16JossManual testing13049811728671490--6.18017.633%
2023-02-16JossManual testing13049814871786010--17.2719.227%
2023-06-29JossJoss130498113373440080--47.2720.748%
2023-09-05Sid & AndyBarrel_Of_Monkeys23800000122251996020--432.827.834%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-11-03ANONYMOUSv4_computers212570.015
2003-06-17ANONYMOUSv4_computers212580.029
2016-02-23Mark RoseManual testing2582600.088
2009-02-16Sturle Sundegoldiek.ifi2602610.118
2011-05-09XyzzyManual testing2612620.235
2013-01-03dbaughManual testing2622630.752
2015-04-09snme2pm1Manual testing2632641.504
2015-04-09snme2pm1Manual testing2642652.863
2015-09-29ramgeisManual testing2652665.726
2018-07-18ramgeisManual testing26626711.45
2018-07-18ramgeisManual testing26726822.91


ECM factoring results:
Total ECM effort:20.837 GHz-days
Estimated T-Level:25.707
DigitsB1CompleteFacMiss
201100014.7470.000%
25500001.66119.004%
302500000.14186.808%
3510000000.01099.018%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002469.361
500001274659960.367
250000350000005011.11


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01MadPooManual testing592871F19FC2D27D0.041


PRP results:
dateuseridcompidcofactorsres64
2020-11-06Ethan O'ConnorHighland20201E4CEF0C79ABC57D


CERT results:
dateuseridcompid
2020-11-06Rainchill9900k


P-1 factor-bounds graph:
B1 = 23800000, B2 = 122251996020 (P-1 stage 2)
B1 = 1304981, B2 = 13373440080 (P-1 stage 2)
B1 = 1304981, B2 = 4871786010 (P-1 stage 2)
B1 = 1304981, B2 = 1728671490 (P-1 stage 2)
B1 = 23800000 (P-1 stage 1)
B1 = 1304981, B2 = 143547910 (P-1 stage 2)
B1 = 1304981, B2 = 130498100 (P-1 stage 2)
B1 = 2500000, B2 = 62500000 (P-1 stage 2)
B1 = 1190000, B2 = 34510000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 1304981 (P-1 stage 1)
B1 = 1190000 (P-1 stage 1)
B1 = 10000, B2 = 1000000 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-09T03:30:02+00:00