is 2 844639 - 1
has 254262 decimal digits
takes 0.020 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L629C1E158DC8FBB7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26735.179470.1493%131072131072000.02953.6185%35.208971.2294%1.0801%
PrimeNet2400.000050.0000%80003200000.000922.8164%0.000961.4082%11.4082%
GPU722440.000054.5455%140005500000.001517.5566%0.001562.5257%7.9803%
Difference+23+35.1794+15.6038%+117072+12557200+0.0279-13.9382%+35.2074+8.7037%+8.7037%

Known prime factors (2 factors, 152.4 bits, 0.01804097% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
844639907136908586700765832066.29853699681673869
7 × 11 × 41 × 919 × 18508943
2009-08-159191850894328.3970.03550.0662
844639819613965874672356531991692686.08348518595866084348256
25 × 3 × 7 × 72200291467387423
2017-11-03327220029146738742323,276,894138,317,708258,338,960

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
844639743502079238035938481138302125944847418195952746152.381
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-01-08T00:00:00ANONYMOUSv4_computers2000200000---0.000--0.207%
2002-02-10T00:00:00ANONYMOUSv4_computers4096409600---0.001--0.441%
2002-04-07T00:00:00ANONYMOUSv4_computers8192819200---0.002--0.793%
2002-05-18T00:00:00ANONYMOUSv4_computers163841638400---0.004--1.287%
2002-06-15T00:00:00ANONYMOUSv4_computers327683276800---0.007--1.928%
2002-12-02T00:00:00ANONYMOUSv4_computers655376553700---0.015--2.710%
2003-08-08T00:00:00ANONYMOUSv4_computers13107213107200---0.029--3.618%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-08-10T00:00:00ANONYMOUSv4_computers21255--0.006--
2001-01-14T00:00:00ANONYMOUSv4_computers21256--0.011--
2001-11-24T00:00:00ANONYMOUSv4_computers21257--0.023--
2003-09-09T00:00:00ANONYMOUSv4_computers21258--0.045--
2008-10-13T02:58:00Sturle Sundeeames.ifi258259--0.045--
2008-10-13T03:27:00Sturle Sundeeames.ifi259260--0.091--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.891 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000322 / 1003.2203.931%
2550000322 / 2801.15031.599%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:13.891 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100014.6920.000%
25500001.60920.008%
302500000.13187.737%
3510000000.00999.133%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000001955.439
500005000000832.315
25000025000000446.136


Lucas-Lehmer results:
No L-L results for M844639


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T03:53:48Oliver KruseGTX-3
90713690858670076583
613BDA7E8CB896__no
2017-10-14T06:39:49Oliver KruseGTX-0613BDA7E8CB896__no
2017-11-04T10:14:27kkmrkkblmbrbkc4.xlarge
90713690858670076583
81961396587467235653199169
4CB024680EDA6B__no
2017-11-04T12:08:11ATHec2-1xf
90713690858670076583
81961396587467235653199169
4CB024680EDA6B__no


P-1 factor-bounds graph:
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 65537, B2 = 6553700 (P-1 stage 2)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 65537 (P-1 stage 1)
B1 = 8192, B2 = 819200 (P-1 stage 2)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 8192 (P-1 stage 1)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-10-14T13:15:41+00:00