is 2 1909703 - 1
has 574878 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF55D22EDA9D27AA7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26831.211669.1176 %80000003200000001.96659.7351 %33.178072.1241 %
Target2610.160965.5738 %100008500000.00441.7597 %0.165266.1796 %
Difference+7+31.0507+3.5439 %+7990000+319150000+1.9621+7.9754%+33.0128+5.9445 %

Known prime factors (1 factor, 78.0 bits, 0.00408696% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19097033126454240554037814900412478.04981857080408682340
22 × 32 × 5 × 822791 × 552706043
2020-04-0882279155270604332,0562.43004.4242

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2011-06-14kurlykurlytop10000003000000012--0.20310.440%
2017-12-06mikrS063800000032000000012--1.96615.741%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-04-14GrunwalderGIMPv4_computers212560.005
2011-04-14GrunwalderGIMPv4_computers2562570.005
2003-01-09ANONYMOUSv4_computers212580.020
2011-04-14GrunwalderGIMPv4_computers2572580.010
2011-04-14GrunwalderGIMPv4_computers2582590.020
2011-04-14GrunwalderGIMPv4_computers2592600.040
2009-05-27Architects Cubedi4l_12602610.080
2011-04-14GrunwalderGIMPv4_computers2602610.080
2011-03-07GrunwalderGIMPGWPrime022612620.161
2011-03-07GrunwalderGIMPGWPrime022622630.514
2015-05-18omylistManual testing2632641.028
2015-05-19monstManual testing2642651.957
2015-09-01ramgeisManual testing2652663.913
2017-03-15Smok_bmvManual testing2662677.826
2019-04-27chuenkitManual testing26726815.65


ECM factoring results:
Total ECM effort:39.260 GHz-days
Estimated T-Level:25.714
DigitsB1CompleteFacMiss
201100014.9150.000%
25500001.68318.591%
302500000.14386.690%
3510000000.01099.020%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001057.180
50000500000020.139
50000660000014411.28
250000400000004820.66


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-17ANONYMOUSv4_computersF55D22EDA9D27AA70.104
2015-07-14MadPooManual testingF55D22EDA9D27AA70.104


PRP results:
dateuseridcompidcofactorsres64
2020-04-08M Millercruncher
312645424055403781490041
85A2BE5352F6586A
2020-04-11GANKL-SCH02
312645424055403781490041
85A2BE5352F6586A


CERT results:
No CERT results for M1909703


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
104
105
106
107
104
105
106
107
108
109
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
258
257
256
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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Last modified: 2024-02-29T14:28:04+00:00