is 2 1891907 - 1
has 569521 decimal digits
takes 0.103 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
Actual26715.705868.6567%500000290358684012.481210.4318%28.187071.9264%3.2697%
PrimeNet2570.010163.1579%90001600000.00143.0356%0.011564.2763%1.1184%
GPU722610.162465.5738%100001600000.00141.7259%0.163866.1679%0.5942%
Difference+6+15.5434+3.0829%+490000+2903426840+12.4798+8.7059%+28.0232+5.7585%+5.7585%

Known prime factors (4 factors, 232.0 bits, 0.01226019% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
189190715589313691030.538412
22 × 103
-41038.235e-117.389e-78.133e-7
18919074805635681310835191858.738127005071637
3 × 167 × 253503137
2015-09-281672535031370.02531.08652.0292
18919071823818095107482688232167.30648200521883673
3 × 16066840627891
2020-11-3031606684062789127.30968,858128,608
1891907488381071579283335716732375.37012907110962094948
22 × 32 × 358530860058193
2021-11-1993585308600581935,714.91,536,5742,869,892

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
18919077491656211581148017280075112789.275
18919072843207239812880189306194086873097.843
18919077613525725107791625877684951033732105.908
18919078764605314068877180766059186447682813738126.043
18919072346981503658225041705769532364473555728741134.108
1891907890718235654279685266121392729025714185087943142.676
189190713663418161006069663704493116263912415639112955348156.581
18919073658783088515595272376457392287438567196440083590350164.646
189190713885685985017908404608037520872467026507617993323
351
53173.214
189190742804673352544394078843857456588549801263575767449
67392563201
61201.413
189190766729548029079851894607548642040446011408504100985
54581148911353952169
70231.951
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-12T07:28:14Lisander ViaeneDesktop5000002903586840-
skipped known factor: 1558931369
skipped known factor: 480563568131083519
--12.48--10.432%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-09-28T11:49:52TJAOIManual testing258259*58.738180.0050.2090.010


ECM factoring results:

Old Calculation Method

Total ECM effort:19.248 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:19.248 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110008.5430.019%
25500000.77446.108%
302500000.04895.323%
3510000000.00299.780%


ECM Summary

B1B2factorcurvesGHz-days
500005000000281.941
50000500000070.485
500006600000362.816
50000660000017213.45
50000675000070.553


Lucas-Lehmer results:
No L-L results for M1891907


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:28:49alpertronManual testing
1558931369
480563568131083519
67ADBBACBFDA7B__no
2017-10-20T03:03:45Oliver KruseThreadripper
1558931369
480563568131083519
67ADBBACBFDA7B__no
2020-12-01T01:39:22Poaopc-Home
1558931369
480563568131083519
182381809510748268823
E9A9483F919B0A52no
2021-11-19T18:18:26JackBlockWin10
1558931369
480563568131083519
182381809510748268823
48838107157928333571673
E9A9483F919B0A52no


P-1 factor-bounds graph:
B1 = 500000, B2 = 2903586840 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
267
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2100
Last modified: 2022-04-12T07:28:14+00:00