is 2 2129807 - 1
has 641136 decimal digits
takes 0.140 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9D300E2D41893E52double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26713.951567.1642%25000001250000000.87468.5777%14.826169.9807%2.8166%
PrimeNet2580.018062.0690%90001600000.00162.6849%0.019763.0874%1.0184%
GPU722620.288564.5161%100001500000.00171.4861%0.290165.0435%0.5273%
Difference+5+13.6630+2.6481%+2490000+124850000+0.8730+7.0916%+14.5360+4.9373%+4.9373%

Known prime factors (1 factor, 87.0 bits, 0.00408387% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
21298071524604333776819528487868172786.97935792077258099431744
26 × 3 × 29 × 14723 × 15199 × 28726079
2017-09-21151992872607912,652,2210.15060.2787

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.278%
2009-08-16T00:00:00harleev4_computers20000265000---0.003--1.029%
2010-10-25T21:20:00Oscar Östlin7501175011---0.007--0.775%
2010-11-25T04:35:00Oscar Östlin800001500000---0.015--2.376%
2013-11-13T18:49:00c10ck3rManual testing50000010000000---0.097--4.775%
2017-09-21T04:28:47mikrMSI2500000125000000122786.9790.8750.2801.7498.578%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers21258--0.018--
1999-04-23T00:00:00ANONYMOUSv4_computers21258--0.018--
2016-02-23T16:29:05Mark RoseManual testing258260--0.054--
2009-01-04T19:16:00Sturle Sundecelair.ifi260261--0.072--
2012-04-13T22:14:00Sebastian HornbostelManual testing261262--0.144--
2013-02-21T00:57:00dbaughManual testing262263--0.461--
2015-03-15T12:13:00VictordeHollanderManual testing263264--0.922--
2015-03-15T12:13:00VictordeHollanderManual testing264265--1.754--
2015-12-27T16:49:11ramgeisManual testing265266--3.509--
2016-10-29T15:24:08Gordon SpenceManual testing266267--7.017--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.719 GHz-days
Estimated T-Level:1.600
DigitsB1CurvesCompleteFacMiss
201100032 / 1000.32072.498%
255000029 / 2800.10490.144%

New Calculation Method

Total ECM effort:2.719 GHz-days
Estimated T-Level:1.600
DigitsB1CompleteFacMiss
20110000.93639.213%
25500000.08591.892%
302500000.00599.481%


ECM Summary

B1B2factorcurvesGHz-days
40000600000030.246
500005000000292.472


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computers9D300E2D41893E520.140
1999-04-23T00:00:00ANONYMOUSv4_computers9D300E2D41893E520.140


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-08T14:20:06Oliver KruseGTX-0
152460433377681952848786817
6E77F850397B1A__no
2017-11-18T06:14:16kkmrkkblmbrbkold
152460433377681952848786817
6E77F850397B1A__no


P-1 factor-bounds graph:
B1 = 2500000, B2 = 125000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1500000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 75011 (P-1 stage 1)
B1 = 20000, B2 = 265000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2017-11-18T06:14:16+00:00