is 2 2079487 - 1
has 625988 decimal digits
takes 0.137 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC3E93B097636BB7Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.289168.6567%500000150000000.12305.1471%14.412070.2700%1.6133%
PrimeNet2580.018563.7931%90001600000.00162.6728%0.020164.7608%0.9677%
GPU722620.295466.1290%90001300000.00151.3677%0.296966.5923%0.4632%
Difference+5+13.9936+2.5277%+491000+14870000+0.1215+3.7795%+14.1151+3.6777%+3.6777%

Known prime factors (1 factor, 65.7 bits, 0.00315899% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2079487595499972208735026712065.69114318434599705
32 × 5 × 101 × 3150370649
2009-01-0710131503706494.710216.36430.563

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.276%
2016-03-16T13:44:51alpertronManual testing5000001500000012---0.123--5.147%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10T00:00:00ANONYMOUSv4_computers21258--0.018--
2022-03-09T08:46:53LordJuliusManual testing21260--0.074--
2009-01-03T02:44:00Sturle Sundeinteravia.ifi260261--0.074--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.843 GHz-days
Estimated T-Level:1.550
DigitsB1CurvesCompleteFacMiss
201100031 / 1000.31073.230%
255000031 / 2800.11189.502%

New Calculation Method

Total ECM effort:2.843 GHz-days
Estimated T-Level:1.550
DigitsB1CompleteFacMiss
20110001.23729.020%
25500000.11589.120%
302500000.00799.272%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000171.445
500007150000141.398


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17T00:00:00ANONYMOUSv4_computersC3E93B097636BB7B0.137


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T16:20:49Oliver KruseGTX-0
59549997220873502671
618CC85EE38465__no
2017-11-16T15:57:30kkmrkkblmbrbkold
59549997220873502671
618CC85EE38465__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
261
260
258
250
260
270
280
290
2100
Last modified: 2022-07-09T04:39:02+00:00