is 2 2591587 - 1
has 780146 decimal digits
takes 0.180 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1299AF7A7E4527A8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.465567.1642%30000080000000.07244.3961%11.537968.6077%1.4435%
PrimeNet2590.029662.7119%110002000000.00212.6933%0.031863.7161%1.0043%
GPU722630.615865.0794%120002000000.00221.5293%0.618165.6134%0.5341%
Difference+4+10.8497+2.0848%+288000+7800000+0.0701+2.8667%+10.9198+2.9942%+2.9942%

Known prime factors (1 factor, 78.8 bits, 0.00303970% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25915875176854198670613883119532478.77699878070824375448
23 × 3 × 11 × 31 × 97 × 125815106701
2014-06-199712581510670126,321689.411,287.6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.294%
2003-11-08T00:00:00Team Prime Ribv4_computers15000206250---0.003--0.898%
2010-11-15T22:51:00Jocelyn LaroucheManual testing2000020000---0.002--0.317%
2011-01-13T23:58:00Jocelyn LaroucheManual testing5000050000---0.005--0.622%
2011-02-22T20:38:00James Heinrichi7-9203000008000000---0.072--4.396%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.030--
2022-03-11T02:05:05LordJuliusManual testing21260--0.059--
2009-01-28T15:43:00Sturle Sundegigi.ifi260261--0.059--
2012-06-22T22:45:00Sebastian HornbostelManual testing261262--0.119--
2013-01-14T11:55:00dbaughManual testing262263--0.379--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.832 GHz-days
Estimated T-Level:0.450
DigitsB1CurvesCompleteFacMiss
20110009 / 1000.09091.352%
25500009 / 2800.03296.831%

New Calculation Method

Total ECM effort:0.832 GHz-days
Estimated T-Level:0.450
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000090.832


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computers1299AF7A7E4527A80.180


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T13:04:54Oliver KruseGTX-2
517685419867061388311953
2736A5126B9607__no
2017-12-02T04:12:52storm5510HP-Z220-CMT
517685419867061388311953
2736A5126B9607__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 206250 (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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261
260
259
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260
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2100
Last modified: 2022-03-11T02:05:05+00:00