is 2 2692247 - 1
has 810448 decimal digits
takes 0.208 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2F028245E60BFE82double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.036867.1642%2000000600000000.57797.7054%11.614769.6943%2.5301%
PrimeNet2590.028562.7119%120002200000.00262.8416%0.031163.7714%1.0596%
GPU722630.592865.0794%140002200000.00281.6604%0.595665.6592%0.5798%
Difference+4+10.4440+2.0848%+1986000+59780000+0.5751+6.0450%+11.0191+4.0351%+4.0351%

Known prime factors (1 factor, 71.6 bits, 0.00265925% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
269224735631515512775465709672271.594661743062816589
32 × 13 × 5655923613817
2018-06-22135655923613817191.7634,51064,456

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.297%
2003-11-28T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.920%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.319%
2010-12-26T02:29:00Jocelyn LaroucheManual testing3000030000---0.003--0.438%
2011-01-31T19:56:00markrtiny1050002310000---0.025--2.875%
2016-07-14T05:43:48Jocelyn LaroucheManual testing16750046200006---0.046--3.627%
2016-12-21T00:33:41Jocelyn Larouchelow 4M201000201000---0.023--1.395%
2017-04-22T17:25:07Jocelyn Larouchelow 4M33500033500006---0.056--3.713%
2019-07-04T12:48:54alpertronManual testing20000006000000012---0.578--7.705%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:19Mark RoseManual testing21260--0.057--
2009-01-26T22:00:00Sturle Sundegicy.ifi260261--0.057--
2012-05-05T03:31:00markroldgamer261262--0.114--
2013-01-14T12:26:00dbaughManual testing262263--0.365--
2015-02-23T17:25:00VictordeHollanderManual testing263264--0.729--
2015-02-23T17:25:00VictordeHollanderManual testing264265--1.388--
2016-01-27T13:46:24ramgeisManual testing265266--2.776--
2017-09-15T16:43:52Gordon SpenceManual testing266267--5.551--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.106 GHz-days
Estimated T-Level:1.500
DigitsB1CurvesCompleteFacMiss
201100030 / 1000.30073.970%
255000030 / 2800.10789.823%

New Calculation Method

Total ECM effort:3.106 GHz-days
Estimated T-Level:1.500
DigitsB1CompleteFacMiss
20110000.96837.994%
25500000.08791.625%
302500000.00599.463%


ECM Summary

B1B2factorcurvesGHz-days
500005000000272.795
50000500000030.311


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23T00:00:00curtiscv4_computers2F028245E60BFE820.208


PRP results:
dateuseridcompidcofactorsres64PRP
2018-06-22T09:57:01Anton RepkoManual testing
3563151551277546570967
0B40D2DD2F9EA7__no
2018-06-22T23:51:18GunnarLuRibenboim
3563151551277546570967
0B40D2DD2F9EA7__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 335000, B2 = 3350000 (P-1 stage 2)
B1 = 167500, B2 = 4620000 (P-1 stage 2)
B1 = 335000 (P-1 stage 1)
B1 = 105000, B2 = 2310000 (P-1 stage 2)
B1 = 201000 (P-1 stage 1)
B1 = 167500 (P-1 stage 1)
B1 = 105000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-07-04T12:48:54+00:00