is 2 2159783 - 1
has 650160 decimal digits
takes 0.142 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L755E5153F71EE7EFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26713.757867.1642 %500000150000000.12305.1706 %13.880868.8620 %
Target2620.284564.5161 %100008000000.00511.5192 %0.289565.0552 %
Difference+5+13.4734+2.6481 %+490000+14200000+0.1179+3.6514%+13.5913+3.8068 %

Known prime factors (1 factor, 80.9 bits, 0.00374544% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
215978322454700480188669819594632580.893519836957698728757
519836957698728757
2015-01-211519836957698728757113,3762.700e+95.043e+9

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-03-07ANONYMOUSv4_computers204820480012--0.0010.776%
2010-11-04JossManual testing1500015000--0.0010.577%
2010-11-07JossManual testing3000030000--0.0030.934%
2010-11-07JossManual testing4500045000--0.0041.197%
2011-01-15JossManual testing5000050000--0.0051.272%
2011-01-23markrtiny12000023400006--0.0234.991%
2014-10-03JossManual testing149718149718--0.0142.218%
2016-04-01alpertronManual testing5000001500000012---8.254%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-01-29ANONYMOUSv4_computers212580.018
2022-03-09LordJuliusManual testing21260
2009-01-04Sturle Sundegolli.ifi2602610.071
2009-01-08Sturle Sundeghia.ifi2612620.142
2013-01-23dbaughManual testing2622630.455


ECM factoring results:
Total ECM effort:16.275 GHz-days
Estimated T-Level:21.839
DigitsB1CompleteFacMiss
20110003.8792.068%
25500000.36869.222%
302500000.02497.668%
3510000000.00199.888%


ECM Summary

B1B2factorcurvesGHz-days
10.256
500005000070.355
500005000000120.887
50000665072470.679
50000665734970.679
50000715000070.703
50000291150615012.72


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14ANONYMOUSv4_computers755E5153F71EE7EF0.142


PRP results:
dateuseridcompidcofactorsres64
2017-10-09Oliver KruseGTX-2
2245470048018866981959463
6DD7637B28C5D09A
2017-11-19kkmrkkblmbrbkold
2245470048018866981959463
6DD7637B28C5D09A


CERT results:
No CERT results for M2159783


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 120000, B2 = 2340000 (P-1 stage 2)
B1 = 149718 (P-1 stage 1)
B1 = 120000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 45000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=21.84 ~= 56-bit
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Last modified: 2024-02-09T03:30:02+00:00