is 2 573851 - 1
has 172747 decimal digits
takes 0.008 GHz-days to do one PRP test
Last-known PrimeNet details:
0 L-L tests remaining
ResidueStatus
L-L74B5EE8CE24BD20Bdouble-checked
PRPC1FB1575AFC80D__
needs double-check

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26751.779870.1493%100000002500000000.48809.2093%52.267879.3586%29.3586%
PrimeNet2400.000050.0000%55002000000.000320.0153%0.000370.0153%20.0153%
GPU722440.000054.5455%100003400000.000615.2088%0.000669.7542%15.2088%
Difference+23+51.7798+15.6038%+9990000+249660000+0.4874-5.9995%+52.2672+9.6043%+9.6043%

Known prime factors (1 factor, 90.3 bits, 0.01573921% known):
Remaining cofactor is not a probable-prime

GHz-days
exponentfactordigitsbits*kmin B1min B2date foundmin. TFmin. P-1normal P-1
57385115449607518606812710736837932890.3201346134059068191282296
23 × 33 × 11 × 29 × 372497 × 52447054067
372497524470540672020-11-08599,244,14760.431112.85

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-12-22T00:00:00ANONYMOUSv4_computers2000200000---0.000--0.184%
2002-01-22T00:00:00ANONYMOUSv4_computers4096409600---0.001--0.399%
2002-03-03T00:00:00ANONYMOUSv4_computers8192819200---0.001--0.728%
2002-04-28T00:00:00ANONYMOUSv4_computers163841638400---0.002--1.192%
2002-05-11T00:00:00ANONYMOUSv4_computers500001000000---0.002--1.546%
2002-06-29T00:00:00ANONYMOUSv4_computers327683276800---0.004--1.801%
2002-09-14T00:00:00ANONYMOUSv4_computers655366553600---0.009--2.550%
2003-05-19T00:00:00ANONYMOUSv4_computers13107213107200---0.018--3.427%
2011-07-01T01:39:00Jocelyn LaroucheManual testing409564409564---0.009--1.529%
2011-08-24T01:38:00Jocelyn LaroucheManual testing682607682607---0.014--1.916%
2012-03-05T12:57:00Jocelyn LaroucheManual testing853259853259---0.018--2.102%
2013-09-27T19:53:00David Campeaui5-2500k104000032240000---0.058--5.527%
2014-02-09T20:00:00c10ck3rManual testing10000000250000000---0.488--9.209%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-04-05T00:00:00ANONYMOUSv4_computers?254--0.004--
2001-04-08T00:00:00ANONYMOUSv4_computers?256--0.017--
2002-01-15T00:00:00ANONYMOUSv4_computers?257--0.033--
2003-11-28T00:00:00ANONYMOUSv4_computers?258--0.067--
2016-02-23T16:28:15Mark RoseManual testing258260--0.201--
2016-02-23T16:28:14Mark RoseManual testing260261--0.268--
2015-07-12T19:53:00NRManual testing261262--0.535--
2015-09-17T08:56:00Gordon SpenceManual testing262263--1.711--
2015-09-17T08:56:00Gordon SpenceManual testing263264--3.421--
2017-11-16T19:56:43BloodERazorManual testing264265--6.511--
2018-06-04T01:37:38chuenkitManual testing265266--13.02--
2020-03-06T12:42:35YxinityManual testing266267--26.04--


ECM factoring results:
ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000003175.137
250000250000001159.318


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-04-11T15:28:00MadPooManual testing74B5EE8CE24BD20B0.008


PRP results:
dateuseridcompidcofactorsres64PRP
2020-11-09T13:10:44mnd9vv
1544960751860681271073683793
C1FB1575AFC80D__no
2020-11-10T19:40:15arnaudSRV-130
1544960751860681271073683793
C1FB1575AFC80D5Ano


P-1 factor-bounds graph:
B1 = 10000000, B2 = 250000000 (stage 2)
B1 = 10000000 (stage 1)
B1 = 1040000, B2 = 32240000 (stage 2)
B1 = 1040000 (stage 1)
B1 = 853259 (stage 1)
B1 = 131072, B2 = 13107200 (stage 2)
B1 = 682607 (stage 1)
B1 = 65536, B2 = 6553600 (stage 2)
B1 = 409564 (stage 1)
B1 = 32768, B2 = 3276800 (stage 2)
B1 = 131072 (stage 1)
B1 = 16384, B2 = 1638400 (stage 2)
B1 = 50000, B2 = 1000000 (stage 2)
B1 = 65536 (stage 1)
B1 = 8192, B2 = 819200 (stage 2)
B1 = 50000 (stage 1)
B1 = 32768 (stage 1)
B1 = 4096, B2 = 409600 (stage 2)
B1 = 16384 (stage 1)
B1 = 2000, B2 = 200000 (stage 2)
B1 = 8192 (stage 1)
B1 = 4096 (stage 1)
B1 = 2000 (stage 1)
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TF factor-bounds graph:
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Last modified: 2020-11-10T19:40:15+00:00