is 2 1838747 - 1
has 553519 decimal digits
takes 0.100 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
Actual26716.159968.6567%500000150000000.10155.0715%16.261370.2463%1.5896%
PrimeNet2570.010463.1579%80001500000.00122.8817%0.011764.2196%1.0617%
GPU722610.167165.5738%90001400000.00131.5961%0.168366.1233%0.5495%
Difference+6+15.9928+3.0829%+491000+14860000+0.1002+3.4753%+16.0930+4.1230%+4.1230%

Known prime factors (3 factors, 159.1 bits, 0.00865501% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18387471722832389131237.32646848
28 × 3 × 61
-2562561.135e-82.014e-54.098e-5
18387475736188238646011549.027155980900
22 × 52 × 37 × 42157
2008-08-2637421574.485e-50.00020.0003
183874781694680121843753115512272.7912221476911229325
52 × 88859076449173
2019-01-072588859076449173908.00380,828711,280

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1838747988249088768591200464187132686.353
1838747140746240933527192680559974158406334110.117
1838747468616063274868123800476600321530615137121.818
183874780734693187653630161285571676460271579117145386348159.144
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:27alpertronManual testing5000001500000012-
skipped known factor: 172283238913
skipped known factor: 573618823864601
--0.101--5.071%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T20:20:00ANONYMOUSManual testing??49.027154.06095e-60.2138.67968e-6


ECM factoring results:

Old Calculation Method

Total ECM effort:19.239 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.239 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.5750.019%
25500000.77745.986%
302500000.04895.308%
3510000000.00299.779%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.280
50000500000030.207
50000660000021516.75


Lucas-Lehmer results:
No L-L results for M1838747


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T03:23:29Oliver KruseGTX-1
172283238913
573618823864601
EE70D0818814B1__no
2017-11-06T12:21:24kkmrkkblmbrbkc4.xlarge
172283238913
573618823864601
EE70D0818814B1__no
2019-01-07T13:22:15Oliver KruseGTX-7
172283238913
573618823864601
8169468012184375311551
F6A7B775E28DB699no
2019-01-08T10:49:56kkmrkkblmbrbkc5.large
172283238913
573618823864601
8169468012184375311551
F6A7B775E28DB699no


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:
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Last modified: 2021-05-28T18:40:35+00:00