is 2 1805261 - 1
has 543438 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
Actual26716.459668.6567%500000150000000.10155.0603%16.561170.2428%1.5861%
PrimeNet2570.010663.1579%80001500000.00122.8717%0.011964.2159%1.0580%
GPU722610.170265.5738%90001300000.00121.5553%0.171466.1092%0.5354%
Difference+6+16.2895+3.0829%+491000+14870000+0.1002+3.5050%+16.3897+4.1336%+4.1336%

Known prime factors (3 factors, 135.3 bits, 0.00749630% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
180526114442089823.7844
22
-446.196e-133.146e-76.404e-7
18052618934994898631239.701247471
7 × 35353
2008-07-157353536.350e-80.00020.0003
180526142365007443327748719592271.8431173376244302839
32 × 1217 × 107128297663
2020-06-111217107128297663501.02459.13857.52

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1805261129039991540560438072063.484
1805261611839207982201803177954823512995.627
1805261378531125386555413640659164345161734111.544
18052615466780202102792687230213670138451990791341135.328
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:36:17alpertronManual testing5000001500000012-
skipped known factor: 14442089
skipped known factor: 893499489863
--0.101--5.060%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:46:00J FeitsmaManual testing??39.701122.29276e-80.2104.91272e-8


ECM factoring results:

Old Calculation Method

Total ECM effort:17.310 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.310 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024917.17
50000500000020.138


Lucas-Lehmer results:
No L-L results for M1805261


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T19:36:43Oliver KruseGTX-3
14442089
893499489863
0208540B9FF1C6__no
2017-11-11T03:12:45kkmrkkblmbrbkc4.xlarge
14442089
893499489863
0208540B9FF1C6__no
2020-06-11T19:30:06ATHec2-PRPCF
14442089
893499489863
4236500744332774871959
3B53D14D3632CDDDno
2020-06-13T05:41:01Team_InspectorSpudBoy4
14442089
893499489863
4236500744332774871959
3B53D14D3632CDDDno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2021-01-29T12:55:47+00:00