is 2 1738207 - 1
has 523253 decimal digits
takes 0.094 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LDF373D03682F4ED1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26834.291069.1176 %17382071912027700.94877.9770 %35.239771.5811 %
Target2610.176765.5738 %80005500000.00301.4107 %0.179766.0594 %
Difference+7+34.1143+3.5439 %+1730207+190652770+0.9458+6.5663%+35.0601+5.5217 %

Known prime factors (1 factor, 81.9 bits, 0.00470889% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
173820743590115427829611077786632581.8501253881598331775533
3 × 599 × 697763827674889
2019-11-22599697763827674889281,7462,990,4415,585,312

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-02-08Carsten Kossendeymother9500015437506--0.0144.791%
2014-04-05JossManual testing100000100000--0.0082.019%
2014-05-06JossManual testing136926136926--0.0112.335%
2014-09-11JossManual testing173852173852--0.0142.593%
2014-12-02JossManual testing210778210778--0.0172.811%
2015-04-09mikrMSI24754008666000012--0.55612.658%
2018-08-09JossManual testing173820717382070012--0.87413.562%
2018-10-17JossManual testing173820719120277012--0.94913.716%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2003-02-02ANONYMOUSv4_computers212580.022
2016-02-23Mark RoseManual testing2582600.066
2010-04-24Architects Cubedm1_f22602610.088
2016-02-23Mark RoseManual testing2612620.177
2010-11-18GrunwalderGIMPManual testing212630.918
2016-02-23Mark RoseManual testing2622630.565
2015-05-06snme2pm1Manual testing2632641.130
2015-05-06snme2pm1Manual testing2642652.150
2015-09-04ramgeisManual testing2652664.299
2018-03-12TJAOIManual testing2662678.598
2019-06-17TJAOIManual testing26726817.20


ECM factoring results:
Total ECM effort:38.318 GHz-days
Estimated T-Level:25.718
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024816.88
50000500000030.206
250000400000005021.23


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21edoderoov4_computersDF373D03682F4ED10.094
2003-01-25edoderoov4_computersDF373D03682F4ED10.094
2015-07-18MadPooManual testingDF373D03682F4ED10.094


PRP results:
dateuseridcompidcofactorsres64
2019-11-23mnd927016b
4359011542782961107778663
ADB66DC627179BBC
2019-11-26Chang Chia-Tcheex01
4359011542782961107778663
ADB66DC627179BBC


CERT results:
No CERT results for M1738207


P-1 factor-bounds graph:
B1 = 1738207, B2 = 191202770 (P-1 stage 2)
B1 = 1738207, B2 = 173820700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1738207 (P-1 stage 1)
B1 = 210778 (P-1 stage 1)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 173852 (P-1 stage 1)
B1 = 136926 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
258
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.72 ~= 69-bit
250
260
270
280
290
JSON version of this page
Last modified: 2024-02-29T14:28:04+00:00