is 2 26647 - 1
has 8022 decimal digits
takes 0.000 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671,115.094377.6119%500000000100000000000.668113.5927%1,115.762480.6551%3.0431%
PrimeNet2400.000062.5000%500100000.00003.9810%0.000063.9929%1.4929%
GPU722440.000165.9091%500100000.00001.6982%0.000166.4880%0.5789%
Difference+23+1,115.0942+11.7028%+499999500+9999990000+0.6681+11.8944%+1,115.7623+14.1670%+14.1670%

Known prime factors (3 factors, 170.5 bits, 0.63974326% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2664747804719825.511897
3 × 13 × 23
-13232.003e-108.893e-91.737e-8
2664767668457691032.656126972
22 × 32 × 3527
2008-08-26935273.185e-81.317e-72.354e-7
26647641866204406645440301719521601639934112.306120438736894705865632476361617
3 × 12263 × 3273770336097906048886253
2018-05-221226332737703360979060488862535.724e+121.171e+142.187e+14

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
266473234871605033839111858.166
2664730684233537256247006254976946980825358688142137.817
266474343409609553197853188832828174761060776583144144.962
2664720763547588659033892309540728886973540256647687564
89
52170.472
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-12-15T22:44:24kkmrkkblmbrbkManual testing5000000001000000000012-
skipped known factor: 47804719
skipped known factor: 6766845769
--0.668--13.593%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T19:59:00ANONYMOUSManual testing??32.656101.03736e-83.02523e-52.60108e-8


ECM factoring results:

Old Calculation Method

Total ECM effort:18.594 GHz-days
Estimated T-Level:32.557
DigitsB1CurvesCompleteFacMiss
20110001600 / 10016.0000.000%
25500001600 / 2805.7140.326%
302500001410 / 6402.20311.027%
351000000808 / 15800.51159.956%
403000000500 / 47000.10689.907%

New Calculation Method

Total ECM effort:18.594 GHz-days
Estimated T-Level:32.557
DigitsB1CompleteFacMiss
2011000200.3350.000%
255000040.4240.000%
302500006.8160.110%
3510000000.95838.365%
4030000000.11589.179%
45110000000.01298.809%
50440000000.00199.889%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001890.089
2000002000000010.002
250000250000006021.422
10000001000000003082.910
300000030000000048613.77
3000000300000000140.397


Lucas-Lehmer results:
No L-L results for M26647


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T19:36:14Oliver KruseOllaptop
47804719
6766845769
382D2964684832__no
2017-09-21T21:28:55Oliver KruseManual testing
47804719
6766845769
382D2964684832__no
2017-10-12T16:30:02kkmrkkblmbrbkManual testing
47804719
6766845769
382D2964684832__no
2018-05-23T09:46:51Gabriel Lignelli
47804719
6766845769
6418662044066454403017195216016399
7D0F4CCD0C8E51__no
2018-05-24T16:14:08NetaniasWin10
47804719
6766845769
6418662044066454403017195216016399
7D0F4CCD0C8E51__no


P-1 factor-bounds graph:
B1 = 500000000, B2 = 10000000000 (P-1 stage 2)
B1 = 500000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-12-06T16:45:58+00:00