is 2 2648207 - 1
has 797190 decimal digits
takes 0.205 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L3620F98D92F7D759double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26822.507667.6471%2000000500000000.51696.8574%23.024569.8656%2.2186%
PrimeNet2590.029062.7119%110002000000.00242.7040%0.031463.7201%1.0083%
GPU722630.602765.0794%130002000000.00261.5745%0.605365.6292%0.5498%
Difference+5+21.9050+2.5677%+1987000+49800000+0.5143+5.2829%+22.4192+4.2364%+4.2364%

Known prime factors (1 factor, 74.3 bits, 0.00280729% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2648207239589032925612923921772374.3434523608481618184
23 × 3 × 7 × 83 × 281 × 1154493031
2020-07-1428111544930311,865.07.044313.157

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.239%
2009-06-22T14:24:00harleeP4_260030000420000---0.006--1.207%
2011-01-17T07:25:00James Heinrichi7-9201800004275000---0.045--3.228%
2016-12-28T03:20:12Jocelyn Larouchelow 4M171988171988---0.019--1.126%
2016-12-29T21:56:29Jocelyn Larouchelow 4M206385206385---0.023--1.238%
2017-05-08T05:55:49Jocelyn Larouchelow 4M36000036000006---0.060--3.423%
2019-11-29T02:54:12masserManual testing20000005000000012---0.517--6.857%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00Ethan O'Connorv4_computers21259--0.029--
2016-02-23T16:29:18Mark RoseManual testing259260--0.029--
2009-01-30T23:08:00Sturle Sundegolan.ifi260261--0.058--
2012-06-10T01:55:00markroldgamer261262--0.116--
2013-01-23T08:31:00dbaughManual testing262263--0.371--
2015-02-23T17:25:00VictordeHollanderManual testing263264--0.741--
2015-02-23T17:25:00VictordeHollanderManual testing264265--1.411--
2016-01-21T23:03:50ramgeisManual testing265266--2.822--
2017-09-08T08:21:16Gordon SpenceManual testing266267--5.644--
2019-02-18T10:31:25TJAOIManual testing267268--11.29--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.614 GHz-days
Estimated T-Level:1.750
DigitsB1CurvesCompleteFacMiss
201100035 / 1000.35070.345%
255000035 / 2800.12588.230%

New Calculation Method

Total ECM effort:3.614 GHz-days
Estimated T-Level:1.750
DigitsB1CompleteFacMiss
20110001.12932.335%
25500000.10290.299%
302500000.00699.374%


ECM Summary

B1B2factorcurvesGHz-days
500005000000333.408
50000500000020.207


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00Ethan O'Connorv4_computers3620F98D92F7D7590.205
2018-07-16T17:29:07kkmrkkblmbrbkold3620F98D92F7D7590.205


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-15T01:31:35pew10980xe_1
23958903292561292392177
FBB928DBE4581003no
2020-07-15T03:07:51oodairacom2
23958903292561292392177
FBB928DBE4581003no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 50000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 360000, B2 = 3600000 (P-1 stage 2)
B1 = 180000, B2 = 4275000 (P-1 stage 2)
B1 = 360000 (P-1 stage 1)
B1 = 206385 (P-1 stage 1)
B1 = 180000 (P-1 stage 1)
B1 = 171988 (P-1 stage 1)
B1 = 30000, B2 = 420000 (P-1 stage 2)
B1 = 30000 (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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2100
Last modified: 2020-07-15T03:07:51+00:00