is 2 1867211 - 1
has 562087 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L46EEB585A6ECEC5Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.913568.6567%500000150000000.10155.0809%16.015070.2492%1.5925%
PrimeNet2570.010363.1579%90001600000.00143.0283%0.011664.2736%1.1157%
GPU722610.164565.5738%100001500000.00141.6891%0.165966.1553%0.5815%
Difference+6+15.7490+3.0829%+490000+14850000+0.1001+3.3918%+15.8491+4.0940%+4.0940%

Known prime factors (1 factor, 79.9 bits, 0.00428018% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
186721111436465607034585850026892579.920306244597076457504
25 × 3 × 3190047886213099
2015-11-15323190047886213099101,67613,671,74825,535,017

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-08T08:25:00markrtiny2750006000000---0.046--3.927%
2015-10-07T13:37:42Bruno Victal5820K-linux5000001500000012---0.101--5.081%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-07T01:12:00Architects CubedManual testing260261--0.082--
2011-03-08T05:14:00GrunwalderGIMPManual testing21263--0.855--
2015-05-07T23:39:00snme2pm1Manual testing263264--1.051--
2015-05-07T23:39:00snme2pm1Manual testing264265--2.001--
2015-09-10T11:33:00ramgeisManual testing265266--4.002--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.752 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:19.752 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110008.7820.015%
25500000.79645.119%
302500000.04995.196%
3510000000.00299.774%


ECM Summary

B1B2factorcurvesGHz-days
500005000000352.423
50000500000010.069
50000660000021416.71
50000675000070.552


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers46EEB585A6ECEC5A0.101
2015-06-29T14:43:00MadPooManual testing46EEB585A6ECEC5A0.101


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:30:16alpertronManual testing
1143646560703458585002689
FC2175315957DB__no
2017-10-19T21:29:44Oliver KruseGTX-2
1143646560703458585002689
FC2175315957DB__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-08-20T12:37:23+00:00