is 2 1968269 - 1
has 592509 decimal digits
takes 0.129 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L2A010286AE98CC59double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26715.096568.6567 %1000000300000000.24606.2424 %15.342470.6133 %
Target2620.312166.1290 %80005000000.00331.1957 %0.315566.5340 %
Difference+5+14.7843+2.5277 %+992000+29500000+0.2427+5.0467%+15.0270+4.0793 %

Known prime factors (1 factor, 73.7 bits, 0.00374471% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1968269154055595475895404162792373.7063913479191002231
852827 × 4588831253
2016-02-138528274588831253971.8423.91244.518

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-04-19kurlyhex10000003000000012--0.2469.646%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-01-10ANONYMOUSv4_computers212580.020
2016-02-23Mark RoseManual testing2582600.059
2010-01-03S485122USB-W2602610.078
2016-02-23Mark RoseManual testing2612620.156
2011-08-27GrunwalderGIMPManual testing212630.811
2016-02-23Mark RoseManual testing2622630.499
2015-04-14lycornManual testing2632640.997
2015-04-14lycornManual testing2642651.898
2015-09-09ramgeisManual testing2652663.797


ECM factoring results:
Total ECM effort:24.848 GHz-days
Estimated T-Level:25.319
DigitsB1CompleteFacMiss
201100010.5960.003%
25500001.00136.741%
302500000.06493.816%
3510000000.00399.700%


ECM Summary

B1B2factorcurvesGHz-days
500005000000322.274
50000500000030.209
50000675000070.556
50000750000021521.81


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-15David Campeauv4_computers2A010286AE98CC590.129
2015-07-12MadPooManual testing2A010286AE98CC590.129


PRP results:
dateuseridcompidcofactorsres64
2017-09-30alpertronManual testing
15405559547589540416279
0A31C02316E9EFBD
2017-10-20Oliver KruseThreadripper-PC
15405559547589540416279
0A31C02316E9EFBD


CERT results:
No CERT results for M1968269


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
104
105
106
104
105
106
107
108
109
1010
TF factor-bounds graph:
266
265
264
263
262
261
260
258
this exponent TF target: 62
TF double-checked to: 67
ECM T-Level=25.32 ~= 67-bit
250
260
270
280
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Last modified: 2024-02-29T14:28:04+00:00