is 2 1806251 - 1
has 543736 decimal digits
takes 0.098 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
Actual26716.450668.6567%500000150000000.10155.0606%16.552170.2429%1.5862%
PrimeNet2570.010663.1579%80001500000.00122.8720%0.011964.2160%1.0581%
GPU722610.170165.5738%90001300000.00121.5555%0.171366.1093%0.5355%
Difference+6+16.2805+3.0829%+491000+14870000+0.1002+3.5051%+16.3808+4.1336%+4.1336%

Known prime factors (4 factors, 239.7 bits, 0.01327137% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18062513612503721.7851
1
-111.547e-137.866e-81.601e-7
18062512664356540313440768872167.85273753773432193
73753773432193
2020-10-0517375377343219323.375316,090590,369
180625112540928593617884616472270.087347153540499573
3 × 115717846833191
2020-10-153115717846833191210.61495,938926,274
180625112007248902911399913635192579.990332380408451300509
23 × 67 × 12384121 × 17416769
2019-09-16123841211741676991,3900.99571.9826

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
18062519624995994951925717865181612789.637
180625145304142167230389030651724412891.872
1806251433762226835141409222068647805731101.775
180625133413505120009651439584593742969301865288942137.939
180625131991592145643374728591366821060465550288535345147.843
1806251150582051097208550505800523444014940496645579346150.077
1806251120706387486550225854453663650257831896261747116749159.724
180625111556972260091312813716049841518139498181398463685
59
52169.627
180625154397811133481918032785590834307430458895364515798
79
52171.862
180625140120427269466033115798060775476087403308900061907
9512031678556391
66217.930
180625114493516387222785302891984194558969217271561140034
26594452974879998156673
73239.714
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:36:25alpertronManual testing5000001500000012-
skipped known factor: 3612503
--0.101--5.061%


Trial Factoring results:
No TF results for M1806251


ECM factoring results:

Old Calculation Method

Total ECM effort:18.081 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:18.081 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.4000.022%
25500000.76046.789%
302500000.04795.427%
3510000000.00299.786%


ECM Summary

B1B2factorcurvesGHz-days
50000500000021815.04
50000500000010.069
50000500000020.138
50000500000020.138
500006500000352.701


Lucas-Lehmer results:
No L-L results for M1806251


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T20:04:27Oliver KruseGTX-2
3612503
A51720BD1C85A5__no
2017-11-05T14:57:57ATHec2-1xf
3612503
A51720BD1C85A5__no
2019-09-17T19:30:48mnd927016b
3612503
1200724890291139991363519
0CE86BB044F6C95Bno
2019-09-17T20:08:06ATHec2-PRPCFDC
3612503
1200724890291139991363519
0CE86BB044F6C95Bno
2020-10-05T09:46:26M Millercruncher
3612503
266435654031344076887
1200724890291139991363519
0CE86BB044F6C95Bno
2020-10-05T21:12:00kotenok2000shodan1
3612503
266435654031344076887
1200724890291139991363519
0CE86BB044F6C95Bno
2020-10-15T12:36:04tottenhoff3-of-4-Ryzen-5-3600
3612503
266435654031344076887
1254092859361788461647
1200724890291139991363519
0CE86BB044F6C95Bno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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108
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TF factor-bounds graph:
267
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2100
Last modified: 2021-02-26T17:52:37+00:00