is 2 2480717 - 1
has 746771 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA31BDD7382CF7ECEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.027367.6471%2382500857701000.69657.5480%24.723870.0891%2.4420%
PrimeNet2590.031062.7119%100001800000.00192.5342%0.032963.6568%0.9450%
GPU722630.643465.0794%110001600000.00191.3799%0.645365.5612%0.4819%
Difference+5+23.3839+2.5677%+2371500+85610100+0.6946+6.1681%+24.0785+4.5278%+4.5278%

Known prime factors (1 factor, 89.2 bits, 0.00359612% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24807177157526626966999031556733832789.210144263263946814550623
3 × 383 × 10709 × 24439 × 479737177
2020-05-252443947973717780,106,8382.63114.9097

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-07-06T00:00:00ANONYMOUSv4_computers1000001000000---0.015--2.025%
2014-09-23T20:52:00Jocelyn LaroucheManual testing125873125873---0.013--0.938%
2014-10-31T23:15:00mikrMSI238250085770100---0.697--7.548%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-05-16T00:00:00ANONYMOUSv4_computers21258--0.015--
1999-05-09T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-15T03:10:00Sturle Sundescarpia.ifi260261--0.062--
2012-06-09T06:43:00Sebastian HornbostelManual testing261262--0.124--
2013-01-23T08:29:00dbaughManual testing262263--0.396--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.791--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.506--
2015-10-29T11:36:22ramgeisManual testing265266--3.012--
2017-07-22T20:28:37Gordon SpenceManual testing266267--6.025--
2019-07-17T09:51:51TJAOIManual testing267268--12.05--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.857 GHz-days
Estimated T-Level:2.100
DigitsB1CurvesCompleteFacMiss
201100042 / 1000.42065.566%
255000042 / 2800.15086.048%

New Calculation Method

Total ECM effort:3.857 GHz-days
Estimated T-Level:2.100
DigitsB1CompleteFacMiss
20110001.35525.799%
25500000.12288.475%
302500000.00899.249%


ECM Summary

B1B2factorcurvesGHz-days
500005000000393.581
50000500000030.275


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-05-16T00:00:00ANONYMOUSv4_computersA31BDD7382CF7ECE0.172
1999-07-27T00:00:00Stephen Woodv4_computersA31BDD7382CF7ECE0.172
2018-05-30T08:54:10kkmrkkblmbrbkoldA31BDD7382CF7ECE0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2020-05-26T04:59:38Klaus Nordmannno1
715752662696699903155673383
F9E95830D3239373no
2020-05-27T06:02:03Luigi Morelli9800X
715752662696699903155673383
F9E95830D3239373no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 100000, B2 = 1000000 (P-1 stage 2)
B1 = 125873 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
103
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107
103
104
105
106
107
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109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
258
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260
270
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2100
Last modified: 2020-05-27T06:02:03+00:00