is 2 1156271 - 1
has 348073 decimal digits
takes 0.034 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L2AFE8D9CEA5FEA1Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26725.698168.6567 %500000100000000.04374.4298 %25.741870.0452 %
Target2600.132865.0000 %50001300000.00050.7718 %0.133365.2701 %
Difference+7+25.5652+3.6567 %+495000+9870000+0.0432+3.6580%+25.6084+4.7750 %

Known prime factors (1 factor, 69.0 bits, 0.00597166% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
11562716104840688789870051612169.049263988316267980
22 × 3 × 5 × 393017 × 11194949
2015-11-1639301711194949103.250.04220.0490

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-03-16Jossv4_computers10001000--4.30000e-50.039%
2002-03-24Jossv4_computers40004000--0.0000.226%
2002-06-02ANONYMOUSv4_computers500001000000--0.0044.181%
2012-02-03markrtiny5000001000000012--0.0478.611%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-11-10ANONYMOUSv4_computers212570.017
2003-05-04ANONYMOUSv4_computers212580.033
2022-03-07LordJuliusManual testing258260
2009-02-14Sturle Sundeginy.ifi2602610.133
2011-05-09XyzzyManual testing2612620.266
2012-10-07dbaughManual testing2622630.849
2014-12-28Matthias WurtingerManual testing2632641.698
2015-01-10lycornManual testing2642653.231
2015-08-28omylistManual testing2652666.463


ECM factoring results:
Total ECM effort:17.630 GHz-days
Estimated T-Level:25.658
DigitsB1CompleteFacMiss
201100014.8080.000%
25500001.62019.795%
302500000.13287.678%
3510000000.00999.129%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002809.79
50000500000010.038
25000025000000447.798


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-11-11MadPooManual testing2AFE8D9CEA5FEA1A0.034


PRP results:
dateuseridcompidcofactorsres64
2017-09-29Oliver KruseGTX-2
610484068878987005161
B4ACC8BF059DC269
2017-10-17Oliver KruseThreadripper-PC
610484068878987005161
B4ACC8BF059DC269
2018-01-03ATHec2-1xh
610484068878987005161
B4ACC8BF059DC269


CERT results:
No CERT results for M1156271


P-1 factor-bounds graph:
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 50000, B2 = 1000000 (P-1 stage 2)
B1 = 50000 (P-1 stage 1)
B1 = 4000 (P-1 stage 1)
B1 = 1000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
266
265
264
263
262
261
260
258
257
this exponent TF target: 60
TF double-checked to: 67
ECM T-Level=25.66 ~= 69-bit
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00