is 2 2170897 - 1
has 653506 decimal digits
takes 0.143 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LD79CE6BBE06B4BEDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26713.687467.1642 %500000150000000.12305.1738 %13.810468.8630 %
Target2620.283064.5161 %110008000000.00511.5674 %0.288165.0723 %
Difference+5+13.4044+2.6481 %+489000+14200000+0.1178+3.6063%+13.5222+3.7907 %

Known prime factors (1 factor, 66.4 bits, 0.00305837% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2170897969651697960860760072066.39422332973373699
27673 × 807031163
2015-02-13276738070311636.80294.19447.8293

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-03-07ANONYMOUSv4_computers204820480012--0.0010.777%
2010-11-05JossManual testing1500015000--0.0010.578%
2010-11-07JossManual testing3000030000--0.0030.935%
2011-01-15JossManual testing5000050000--0.0051.273%
2011-01-16markrtiny9000016200006--0.0174.436%
2014-06-11JossManual testing119566119566--0.0112.001%
2014-10-05JossManual testing149132149132--0.0142.216%
2016-03-16alpertronManual testing5000001500000012---8.259%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-01-29ANONYMOUSv4_computers212580.018
2022-03-09LordJuliusManual testing21260
2009-01-04Sturle Sundebakeng.ifi2602610.071
2009-01-08Sturle Sundegibsy.ifi2612620.141
2013-09-09ramgeisManual testing2622630.452


ECM factoring results:
Total ECM effort:13.780 GHz-days
Estimated T-Level:21.814
DigitsB1CompleteFacMiss
20110003.8142.206%
25500000.36369.579%
302500000.02397.697%
3510000000.00199.889%


ECM Summary

B1B2factorcurvesGHz-days
10.256
50000465000070.581
500005000000120.888
50000654254470.674
50000715000070.704
50000224443235010.68


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07ANONYMOUSv4_computersD79CE6BBE06B4BED0.143


PRP results:
dateuseridcompidcofactorsres64
2017-10-09Oliver KruseGTX-1
96965169796086076007
3150E762B513B9FB
2017-11-23kkmrkkblmbrbkc4.xlarge
96965169796086076007
3150E762B513B9FB


CERT results:
No CERT results for M2170897


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 149132 (P-1 stage 1)
B1 = 119566 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 50000 (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)
102
103
104
105
106
102
103
104
105
106
107
108
109
TF factor-bounds graph:
263
262
261
260
258
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=21.81 ~= 56-bit
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00