is 2 1786679 - 1
has 537844 decimal digits
takes 0.097 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
Actual26716.630868.6567%500000150000000.10155.0540%16.732370.2408%1.5841%
PrimeNet2570.010763.1579%80001400000.00122.8135%0.011964.1944%1.0366%
GPU722610.171965.5738%80001300000.00121.4928%0.173166.0877%0.5139%
Difference+6+16.4589+3.0829%+492000+14870000+0.1003+3.5612%+16.5592+4.1531%+4.1531%

Known prime factors (3 factors, 178.3 bits, 0.00998141% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17866793336868736596091548.24593381876
22 × 33 × 7 × 149 × 829
-1498293.205e-51.464e-52.385e-5
17866794409773513990631548.648123406989
3 × 97 × 424079
2008-08-26974240793.084e-50.00180.0034
178667932859526727611947825413532581.443919569959897999244
22 × 3 × 76630829991499937
2020-06-08476630829991499937492,673328,420,580613,398,184

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
17866791471483537430481373789835463673096.893
1786679109647927436711931925747800507648831097740129.688
1786679144903070645690366225020756740120295223940130.090
178667948352252627437878757385167452024131289694033677041
4551
54178.336
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:33:59alpertronManual testing5000001500000012-
skipped known factor: 333686873659609
skipped known factor: 440977351399063
--0.101--5.054%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T20:20:00ANONYMOUSManual testing??48.648159.85314e-60.2082.11047e-5


ECM factoring results:

Old Calculation Method

Total ECM effort:17.290 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.290 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000023916.46
500005000000120.827


Lucas-Lehmer results:
No L-L results for M1786679


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T15:35:08Oliver KruseGTX-2
333686873659609
440977351399063
21DE5C6D13B38B__no
2017-11-05T02:35:27kkmrkkblmbrbkc4.xlarge
333686873659609
440977351399063
21DE5C6D13B38B__no
2020-06-08T20:43:00riccardo ubertiColab_noGPU12
333686873659609
440977351399063
3285952672761194782541353
E0AEB7F5D1F62F21no
2020-06-08T20:52:09ATHec2-PRPCFDC
333686873659609
440977351399063
3285952672761194782541353
E0AEB7F5D1F62F21no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
267
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Last modified: 2020-10-23T07:51:34+00:00