is 2 2596943 - 1
has 781758 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-LEFE75F4A19F2D3D4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.441967.1642%17500041562500.03943.5535%11.481368.3310%1.1668%
PrimeNet2590.029662.7119%110002000000.00212.6943%0.031763.7165%1.0047%
GPU722630.614665.0794%120002000000.00221.5300%0.616865.6136%0.5343%
Difference+4+10.8273+2.0848%+163000+3956250+0.0372+2.0235%+10.8645+2.7174%+2.7174%

Known prime factors (1 factor, 78.8 bits, 0.00303519% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25969435343143061326362844535432478.822102873706918603197
3 × 34291235639534399
2015-10-0333429123563953439942,232187,899,778350,944,459

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--0.913%
2010-11-16T23:08:00Jocelyn LaroucheManual testing2000020000---0.002--0.317%
2011-01-15T02:57:00Jocelyn LaroucheManual testing5000050000---0.005--0.622%
2011-04-18T05:14:00James HeinrichWHS1750004156250---0.039--3.554%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.030--
2022-03-11T04:28:46LordJuliusManual testing21260--0.059--
2009-01-29T05:25:00Sturle Sundenouchcraft.ifi260261--0.059--
2012-06-23T10:43:00Sebastian HornbostelManual testing261262--0.118--
2013-01-14T11:55:00dbaughManual testing262263--0.378--
2015-02-27T20:35:00VictordeHollanderManual testing263264--0.756--
2015-02-27T20:35:00VictordeHollanderManual testing264265--1.439--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.294 GHz-days
Estimated T-Level:0.700
DigitsB1CurvesCompleteFacMiss
201100014 / 1000.14086.875%
255000014 / 2800.05095.114%

New Calculation Method

Total ECM effort:1.294 GHz-days
Estimated T-Level:0.700
DigitsB1CompleteFacMiss
20110000.53858.365%
25500000.05095.140%
302500000.00399.686%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.110
50000500000020.185


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-12T00:00:00ANONYMOUSv4_computersEFE75F4A19F2D3D40.180
1999-04-23T00:00:00ANONYMOUSv4_computersEFE75F4A19F2D3D40.180


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:28:59alpertronManual testing
534314306132636284453543
28CD03DA9D42FB__no
2017-11-12T15:16:59Oliver KruseGTX-3
534314306132636284453543
28CD03DA9D42FB__no


P-1 factor-bounds graph:
B1 = 175000, B2 = 4156250 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (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: 2022-03-11T04:28:46+00:00