is 2 1575731 - 1
has 474343 decimal digits
takes 0.070 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L83F2C0E082F43DA1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.857268.6567%100000002000000001.31819.7378%20.175371.7089%3.0522%
PrimeNet2570.012263.1579%70001100000.00082.4793%0.013064.0713%0.9134%
GPU722610.194965.5738%6500600000.00061.0528%0.195665.9362%0.3624%
Difference+6+18.6623+3.0829%+9993500+199940000+1.3175+8.6851%+19.9798+5.7727%+5.7727%

Known prime factors (2 factors, 170.4 bits, 0.01081460% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1575731141008117895178231838326312683.5444474371510593439865
5 × 37 × 24185791949153729
2016-10-2837241857919491537291,249,91885,343,598159,398,074
15757311409266554127657092609768712786.86544717865997675272385
5 × 1051 × 16057 × 529961038511
2016-11-021605752996103851110,903,4811,870.13,492.7

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
157573119871802441016424636348515606788903652982768260776
01
52170.409
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000300000---0.002--1.007%
2011-01-31T23:34:00James HeinrichWHS850001402500---0.010--2.257%
2013-12-10T19:11:00David Campeaui5-2500k97000028130000---0.159--6.002%
2015-03-31T15:54:00VictordeHollanderManual testing10000000200000000---1.318--9.738%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-25T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.024--
2016-02-23T16:28:39Mark RoseManual testing258260--0.073--
2010-05-03T14:20:00Architects Cubeda3_bu2260261--0.097--
2016-02-23T16:28:39Mark RoseManual testing261262--0.195--
2010-06-02T19:48:00GrunwalderGIMPManual testing21263--1.013--
2016-02-23T16:28:39Mark RoseManual testing262263--0.623--
2015-02-26T06:17:00snme2pm1Manual testing263264--1.246--
2015-02-26T06:17:00snme2pm1Manual testing264265--2.371--
2015-10-11T16:52:43ramgeisManual testing265266--4.742--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.051 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.051 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000022912.82
50000500000020.112
500005000000201.120


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-21T00:00:00ANONYMOUSv4_computers83F2C0E082F43DA10.070
2015-07-20T14:32:00MadPooManual testing83F2C0E082F43DA10.070


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T23:11:26Oliver KruseGTX-0
14100811789517823183832631
140926655412765709260976871
A05CF2DBA9930981no
2017-10-05T21:05:09Oliver KruseManual testing
14100811789517823183832631
140926655412765709260976871
A05CF2DBA99309__no
2017-11-10T22:25:24kkmrkkblmbrbkc4.xlarge
14100811789517823183832631
140926655412765709260976871
A05CF2DBA99309__no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 970000, B2 = 28130000 (P-1 stage 2)
B1 = 970000 (P-1 stage 1)
B1 = 85000, B2 = 1402500 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
B1 = 20000, B2 = 300000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-09-09T15:49:50+00:00