is 2 2873033 - 1
has 864870 decimal digits
takes 0.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LE838BA80842B9843double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.342467.1642%11500025300000.02763.0128%10.370068.1535%0.9893%
PrimeNet2590.026762.7119%130002400000.00282.9971%0.029663.8294%1.1176%
GPU722630.555565.0794%160002800000.00341.8699%0.558965.7324%0.6530%
Difference+4+9.7868+2.0848%+99000+2250000+0.0242+1.1429%+9.8110+2.4211%+2.4211%

Known prime factors (1 factor, 67.0 bits, 0.00233205% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28730331476393383052015270732167.000625693985816592
24 × 3 × 535291371179
2015-07-151653529137117915.2343,266.26,100.3

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.303%
2009-07-03T00:55:00Carsten Kossendeyleela15000161250---0.003--0.847%
2010-12-23T00:29:00Jocelyn LaroucheManual testing2000020000---0.002--0.324%
2011-01-03T22:20:00Jocelyn LaroucheManual testing3000030000---0.003--0.444%
2011-01-22T13:10:00Jocelyn LaroucheManual testing5000050000---0.006--0.635%
2011-02-06T03:06:00markrtiny1150002530000---0.028--3.013%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-02-13T17:33:00Sturle Sundegorky.ifi260261--0.053--
2012-01-28T05:10:00Grant McCrackenthumper261262--0.107--
2013-01-10T10:24:00dbaughManual testing262263--0.342--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.683--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.300--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.942 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:0.942 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000090.942


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-12-30T00:00:00ANONYMOUSv4_computersE838BA80842B98430.222
1999-05-09T00:00:00ANONYMOUSv4_computersE838BA80842B98430.222


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-23T06:10:04Oliver KruseGTX-1
147639338305201527073
20F502E98CD4DF__no
2017-12-08T00:45:54kkmrkkblmbrbkc4.xlarge
147639338305201527073
20F502E98CD4DF__no


P-1 factor-bounds graph:
B1 = 115000, B2 = 2530000 (P-1 stage 2)
B1 = 115000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 161250 (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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100
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1010
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TF factor-bounds graph:
267
265
264
263
262
261
250
260
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2100
Last modified: 2017-12-08T00:45:54+00:00