is 2 9214787 - 1
has 2773928 decimal digits
takes 2.547 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7820F364ACF01389double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272103.782566.6667 %2500000368136615081.328910.1635 %185.111470.0545 %
Target2686.468464.7059 %6000065000000.16472.4089 %6.633165.5561 %
Difference+4+97.3141+1.9608 %+2440000+3674866150+81.1643+7.7546%+178.4784+4.4984 %

Known prime factors:
No known factors for M9214787

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-06-17David Costerv4_computers50000812500--0.0372.058%
2012-09-26NesowaOutback11000020350006--0.0863.007%
2021-07-18ThaZ-1702000000162000000--4.2959.303%
2023-12-07Sid & AndyMagic_8_Ball25000003681366150--96.1213.516%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-02-07ANONYMOUSv4_computers212620.033
1999-08-31ANONYMOUSv4_computers212640.213
2013-09-08NesowaManual testing2642650.405
2015-05-08VictordeHollanderManual testing2652660.811
2016-04-25snme2pm1Manual testing2662671.622
2017-03-08snme2pm1Manual testing2672683.244
2019-10-11mnd9Manual testing2682696.488
2021-08-20SRBaseManual testing26927012.98
2021-08-28SRBaseManual testing27027125.95
2021-10-17SRBaseManual testing27127251.90


ECM factoring results:
Total ECM effort:1.261 GHz-days
Estimated T-Level:0.577
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
50000500000031.261


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-07-25curtiscv4_computers7820F364ACF013892.547
2003-06-23David Costerv4_computers7820F364ACF013892.547


PRP results:
No PRP results for M9214787


CERT results:
No CERT results for M9214787


P-1 factor-bounds graph:
B1 = 2500000, B2 = 3681366150 (P-1 stage 2)
B1 = 2000000, B2 = 162000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 110000, B2 = 2035000 (P-1 stage 2)
B1 = 110000 (P-1 stage 1)
B1 = 50000, B2 = 812500 (P-1 stage 2)
B1 = 50000 (P-1 stage 1)
103
104
105
106
107
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
262
this exponent TF target: 68
TF double-checked to: 67
ECM T-Level=0.58 ~= -15-bit
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Last modified: 2024-03-13T02:15:48+00:00