is 2 2554663 - 1
has 769031 decimal digits
takes 0.177 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2149FE6A41C0B7B8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26946.732968.1159 %5000000864646965047.854013.0704 %94.586972.2833 %
Target2630.624765.0794 %120009000000.00611.4786 %0.630865.5957 %
Difference+6+46.1081+3.0366 %+4988000+8645569650+47.8480+11.5919%+93.9561+6.6876 %

Known prime factors:
No known factors for M2554663

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-23ANONYMOUSv4_computers2048204800--0.0010.665%
2003-11-08Team Prime Ribv4_computers15000198750--0.0031.628%
2010-12-19JossManual testing2000020000--0.0020.625%
2011-01-03JossManual testing3000030000--0.0030.826%
2011-01-09JossManual testing5000050000--0.0051.134%
2011-04-09James HeinrichWHS17500040687506--0.0395.394%
2016-03-31mikrMSI320000011200000012--0.91811.854%
2023-01-10Architects Cubedgpu72ng50000008646469650--58.7219.081%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-15ANONYMOUSv4_computers212590.015
2016-02-23Mark RoseManual testing2592600.030
2009-01-30Sturle Sundegorky.ifi2602610.060
2012-06-16Sebastian HornbostelManual testing2612620.120
2013-01-14dbaughManual testing2622630.384
2015-02-23VictordeHollanderManual testing2632652.231
2015-11-04omylistManual testing2652662.925
2017-08-10Gordon SpenceManual testing2662675.850
2019-06-03TJAOIManual testing26726811.70
2021-05-27TJAOIManual testing26826923.40


ECM factoring results:
Total ECM effort:19.981 GHz-days
Estimated T-Level:23.858
DigitsB1CompleteFacMiss
20110008.3370.024%
25500000.77246.223%
302500000.04995.245%
3510000000.00299.772%


ECM Summary

B1B2factorcurvesGHz-days
50000500000019417.73
50000665000070.736
500007000000141.510


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23ANONYMOUSv4_computers2149FE6A41C0B7B80.177
2018-06-12kkmrkkblmbrbkold2149FE6A41C0B7B80.177


PRP results:
No PRP results for M2554663


CERT results:
No CERT results for M2554663


P-1 factor-bounds graph:
B1 = 5000000, B2 = 8646469650 (P-1 stage 2)
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 3200000 (P-1 stage 1)
B1 = 175000, B2 = 4068750 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 198750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
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105
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102
103
104
105
106
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108
109
1010
TF factor-bounds graph:
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268
267
266
265
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=23.86 ~= 63-bit
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Last modified: 2024-03-13T02:15:48+00:00