is 2 1877471 - 1
has 565176 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2E274CFE8C771420double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.826668.6567%500000150000000.10155.0842%15.928070.2503%1.5936%
PrimeNet2570.010263.1579%90001600000.00143.0313%0.011664.2747%1.1168%
GPU722610.163665.5738%100001500000.00141.6910%0.165066.1559%0.5821%
Difference+6+15.6630+3.0829%+490000+14850000+0.1001+3.3933%+15.7630+4.0944%+4.0944%

Known prime factors (1 factor, 95.1 bits, 0.00506448% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1877471419934179443387714422735920892995.08411183506414836439934964
22 × 3 × 73 × 607 × 106297 × 42110745151
2016-02-20106297421107451517.071e+9180.48337.08

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-13T00:36:00markrtiny2750006000000---0.046--3.930%
2015-10-07T14:28:59Bruno Victal5820K-linux5000001500000012---0.101--5.084%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1997-11-25T00:00:00ANONYMOUSv4_computers21257--0.010--
1997-11-29T00:00:00ANONYMOUSv4_computers21257--0.010--
1997-12-04T00:00:00ANONYMOUSv4_computers21257--0.010--
1997-12-21T00:00:00ANONYMOUSv4_computers21257--0.010--
1998-02-01T00:00:00ANONYMOUSv4_computers21257--0.010--
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:56Mark RoseManual testing258260--0.061--
2010-04-11T14:32:00Architects CubedManual testing260261--0.082--
2016-02-23T16:28:56Mark RoseManual testing261262--0.164--
2011-03-08T05:15:00GrunwalderGIMPManual testing21263--0.850--
2016-02-23T16:28:56Mark RoseManual testing262263--0.523--
2015-05-09T06:35:00snme2pm1Manual testing263264--1.046--
2015-05-09T06:35:00snme2pm1Manual testing264265--1.990--
2015-09-12T12:52:00ramgeisManual testing265266--3.980--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.846 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.846 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8170.015%
25500000.79845.014%
302500000.04995.182%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000292.009
50000500000030.208
50000586639070.518
50000660000021917.11


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-11-25T00:00:00ANONYMOUSv4_computers2E274CFE8C7714200.102
1997-11-29T00:00:00ANONYMOUSv4_computers2E274CFE8C7714200.102
1997-12-04T00:00:00ANONYMOUSv4_computers2E274CFE8C7714200.102
1997-12-21T00:00:00ANONYMOUSv4_computers2E274CFE8C7714200.102
1998-02-01T00:00:00ANONYMOUSv4_computers2E274CFE8C7714200.102
1999-01-10T00:00:00ANONYMOUSv4_computers2E274CFE8C7714200.102
2015-06-28T05:06:00MadPooManual testing2E274CFE8C7714200.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T13:00:16Oliver KruseGTX-2
41993417944338771442273592089
8FD721786E9B10__no
2017-11-11T02:55:52kkmrkkblmbrbkc4.xlarge
41993417944338771442273592089
8FD721786E9B10__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
104
105
106
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2021-09-10T07:34:56+00:00