is 2 1903061 - 1
has 572879 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
Actual26715.613768.6567%20000002620000001.27169.2341%16.885471.5510%2.8943%
PrimeNet2570.010163.1579%90001600000.00143.0389%0.011464.2775%1.1196%
GPU722610.161465.5738%100001600000.00141.7279%0.162866.1686%0.5949%
Difference+6+15.4523+3.0829%+1990000+261840000+1.2702+7.5062%+16.7225+5.3824%+5.3824%

Known prime factors (3 factors, 137.4 bits, 0.00722128% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
190306111418367823.4453
3
-135.876e-138.723e-81.601e-7
19030616853112967111239.318180055
5 × 36011
2008-07-155360117.593e-80.00020.0003
1903061298991603900100192412012374.6637855544407144600
23 × 52 × 39277722035723
2018-04-2625392777220357233,489.9168,334314,402

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
190306178251358950920909371962.763
19030613413995863249975333730945387673098.107
19030612049023237744793477646951758698991135113.980
190306123396499320098304266979191612120522909533742137.425
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:53alpertronManual testing5000001500000012-
skipped known factor: 11418367
skipped known factor: 685311296711
--0.101--5.093%
2021-04-07T00:31:41Dylan Delgadodesktoplinux100000071000000-
skipped known factor: 11418367
skipped known factor: 685311296711
--0.379--7.163%
2021-06-30T11:07:30Dylan Delgadolaptop-i787502000000262000000-
skipped known factor: 11418367
skipped known factor: 685311296711
--1.272--9.234%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:48:00J FeitsmaManual testing??39.318123.74428e-80.2207.97833e-8


ECM factoring results:

Old Calculation Method

Total ECM effort:19.279 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:19.279 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
201100010.3110.003%
25500000.94938.714%
302500000.06094.155%
3510000000.00399.718%


ECM Summary

B1B2factorcurvesGHz-days
500005000000322.220
50000500000010.069
50000660000021016.44
50000670000070.552


Lucas-Lehmer results:
No L-L results for M1903061


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T19:05:52Oliver KruseGTX-2
11418367
685311296711
6A9B2C6BF7E9FD__no
2017-11-09T13:39:20kkmrkkblmbrbkold
11418367
685311296711
6A9B2C6BF7E9FD__no
2018-04-28T16:51:12Oliver KruseGTX-5
11418367
685311296711
29899160390010019241201
E28926462FEB06__no
2018-04-28T17:19:33ATHec2-PRPCFDC
11418367
685311296711
29899160390010019241201
E28926462FEB06__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 262000000 (P-1 stage 2)
B1 = 1000000, B2 = 71000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
267
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Last modified: 2021-12-03T11:53:11+00:00