is 2 4786807 - 1
has 1440973 decimal digits
takes 0.630 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LB8F1B909A81440ECdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2676.207565.6716 %3000002286570002.43268.0289 %8.640068.4278 %
Target2651.524164.6154 %3000032500000.03922.2856 %1.563365.4241 %
Difference+2+4.6833+1.0563 %+270000+225407000+2.3933+5.7433%+7.0767+3.0037 %

Known prime factors (1 factor, 67.9 bits, 0.00141915% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
47868072815665627906792509212167.93229410686788780
22 × 5 × 112 × 17 × 19 × 37625933
2010-03-13121376259336.20750.39140.7310

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2009-08-17Carsten Kossendeymother30000420000--0.0102.038%
2023-04-12Kevin_9611Factor_2300000228657000
skipped known factor: 281566562790679250921
--2.9189.585%


Trial Factoring results:
5758596061626364656667
No TF results for M4786807


ECM factoring results:
Total ECM effort:0.263 GHz-days
DigitsB1CompleteFacMiss


ECM Summary

B1B2factorcurvesGHz-days
10.263


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-23schazv4_computersB8F1B909A81440EC0.630
1998-07-11schazv4_computersB8F1B909A81440EC0.630
2000-03-08ANONYMOUSv4_computersB8F1B909A81440EC0.630


PRP results:
dateuseridcompidcofactorsres64
2017-09-20kkmrkkblmbrbkManual testing
281566562790679250921
AA853CA3A0510451
2018-03-22Oliver KruseGTX-1
281566562790679250921
AA853CA3A0510451


CERT results:
No CERT results for M4786807


P-1 factor-bounds graph:
B1 = 300000, B2 = 228657000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 30000, B2 = 420000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
this exponent TF target: 65
TF double-checked to: 67
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Last modified: 2024-02-09T03:30:02+00:00