is 2 2606939 - 1
has 784767 decimal digits
takes 0.181 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L44C06B0A93EAF73Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.398067.1642%2000000600000000.51907.6800%11.917069.6860%2.5218%
PrimeNet2590.029562.7119%110002000000.00212.6962%0.031663.7172%1.0054%
GPU722630.612265.0794%120002000000.00221.5311%0.614565.6140%0.5347%
Difference+4+10.7858+2.0848%+1988000+59800000+0.5167+6.1489%+11.3025+4.0719%+4.0719%

Known prime factors (1 factor, 65.7 bits, 0.00252022% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2606939599589723933127140232065.70111499880203049
7 × 1642840029007
2015-12-14716428400290073.08969,002.016,813

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_computers15000217500---0.003--0.914%
2010-11-16T23:09:00Jocelyn LaroucheManual testing2000020000---0.002--0.317%
2010-12-15T19:49:00markrtiny1000002125000---0.021--2.782%
2014-10-10T20:28:00Jocelyn LaroucheManual testing124621124621---0.013--1.081%
2019-07-04T12:42:10alpertronManual testing20000006000000012---0.519--7.680%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.029--
2022-03-11T04:28:47LordJuliusManual testing21260--0.059--
2009-01-27T00:10:00Sturle Sundeothello.ifi260261--0.059--
2012-06-24T12:11:00Sebastian HornbostelManual testing261262--0.118--
2013-01-14T11:55:00dbaughManual testing262263--0.377--
2015-02-18T11:41:00VictordeHollanderManual testing263264--0.753--
2015-02-18T11:41:00VictordeHollanderManual testing264265--1.433--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.295 GHz-days
Estimated T-Level:0.700
DigitsB1CurvesCompleteFacMiss
201100014 / 1000.14086.875%
255000014 / 2800.05095.114%

New Calculation Method

Total ECM effort:1.295 GHz-days
Estimated T-Level:0.700
DigitsB1CompleteFacMiss
20110000.45263.660%
25500000.04196.001%
302500000.00399.749%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.110
50000500000020.185


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computers44C06B0A93EAF73A0.181


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:30:56alpertronManual testing
59958972393312714023
CA21712F19DD5A__no
2017-11-13T03:45:55Oliver KruseGTX-2
59958972393312714023
CA21712F19DD5A__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 100000, B2 = 2125000 (P-1 stage 2)
B1 = 124621 (P-1 stage 1)
B1 = 100000 (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: 2022-03-11T04:28:47+00:00