is 2 5628157 - 1
has 1694245 decimal digits
takes 0.889 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3D372D0BC8A294FBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272169.919568.0556 %8000000640959891081.694411.4726 %251.614071.7204 %
Target2662.624065.1515 %3600035000000.05152.1918 %2.675565.9153 %
Difference+6+167.2955+2.9040 %+7964000+6406098910+81.6430+9.2808%+248.9385+5.8051 %

Known prime factors:
No known factors for M5628157

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2000-11-15ANONYMOUSv4_computers25000137500--0.0071.234%
2011-01-19USAFSSP4_26006500010237506--0.0302.730%
2019-10-25USAFSS6917th_Scty_Sq3400001011500012--0.2005.682%
2022-11-12Sid & AndyRocky80000006409598910--91.6816.846%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-09-27ANONYMOUSv4_computers212620.055
2009-04-15GrunwalderGIMPManual testing2622630.174
2014-11-15NesowaManual testing2632640.349
2014-11-17monstManual testing2642650.664
2015-10-15ramgeisManual testing2652661.328
2016-06-18Gordon SpenceManual testing2662672.655
2018-07-05ramgeisManual testing2672685.311
2020-07-17TJAOIManual testing26826910.62
2020-12-15ANONYMOUSManual testing26927163.73
2024-01-19One ManManual testing27127284.98


ECM factoring results:
Total ECM effort:2.161 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
50000500000092.161


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-11ANONYMOUSv4_computers3D372D0BC8A294FB0.889
2000-12-14ANONYMOUSv4_computers3D372D0BC8A294FB0.889


PRP results:
No PRP results for M5628157


CERT results:
No CERT results for M5628157


P-1 factor-bounds graph:
B1 = 8000000, B2 = 6409598910 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 340000, B2 = 10115000 (P-1 stage 2)
B1 = 340000 (P-1 stage 1)
B1 = 65000, B2 = 1023750 (P-1 stage 2)
B1 = 65000 (P-1 stage 1)
B1 = 25000, B2 = 137500 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
272
271
269
268
267
266
265
264
263
262
this exponent TF target: 66
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
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Last modified: 2024-03-13T02:15:48+00:00