is 2 1914487 - 1
has 576319 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.520668.6567%500000150000000.10155.0962%15.622070.2540%1.5973%
PrimeNet2570.010063.1579%90001700000.00143.0912%0.011464.2968%1.1389%
GPU722610.160565.5738%100001700000.00151.7605%0.161966.1799%0.6061%
Difference+6+15.3601+3.0829%+490000+14830000+0.1000+3.3357%+15.4601+4.0742%+4.0742%

Known prime factors (3 factors, 168.9 bits, 0.00882074% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
191448730631793824.8698
23
-881.169e-126.293e-71.281e-6
19144873062008763094675711832168.05379969432100993
137 × 421 × 1386504709
2021-01-19421138650470951.7685.942211.098
1914487730023554383130961853672375.95019065774653552909
19065774653552909
2022-01-181190657746535529096,305.981,711,144152,613,661

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
191448793794818595302145806904211192892.922
1914487223619304029883103153925157303131100.819
19144872235338520786669564236445904067818783547916144144.003
191448768472426853663459251091013989103282939151571556567
3
51168.872
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:42:23alpertronManual testing5000001500000012-
skipped known factor: 30631793
--0.101--5.096%


Trial Factoring results:
No TF results for M1914487


ECM factoring results:

Old Calculation Method

Total ECM effort:21.458 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:21.458 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
201100010.9760.002%
25500001.05334.879%
302500000.06893.459%
3510000000.00399.682%


ECM Summary

B1B2factorcurvesGHz-days
50000490000030.207
500005000000342.361
50000650000070.544
500008000000665.685
50000800000014712.66


Lucas-Lehmer results:
No L-L results for M1914487


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:14:45alpertronManual testing
30631793
5554AF30DD2B34__no
2017-10-20T04:28:18Oliver KruseGTX-1
30631793
5554AF30DD2B34__no
2021-01-24T00:36:45roemer2201ws-rebentrost-o
30631793
306200876309467571183
FE4C3F64AE24C5BEno
2021-01-24T20:12:09Richard Thomasdjinn.pc
30631793
306200876309467571183
FE4C3F64AE24C5BEno
2022-01-20T17:07:39JackBlockWin10
30631793
306200876309467571183
73002355438313096185367
FE4C3F64AE24C5BEno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
1017
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2022-01-20T17:07:39+00:00