is 2 1952663 - 1
has 587811 decimal digits
takes 0.106 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
Actual26715.217168.6567%500000150000000.10155.1083%15.318670.2578%1.6011%
PrimeNet2580.019763.7931%80001400000.00122.4674%0.020964.6865%0.8934%
GPU722620.314666.1290%8000900000.00101.1534%0.315666.5197%0.3907%
Difference+5+14.9025+2.5277%+492000+14910000+0.1005+3.9549%+15.0030+3.7381%+3.7381%

Known prime factors (2 factors, 91.0 bits, 0.00466146% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19526633905327721.8971
1
-111.431e-137.866e-81.601e-7
19526636439979082136022019292169.126164902471192828
22 × 17 × 41 × 1427 × 41448653
2021-02-22142741448653114.000.17770.3318

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
195266325150224188901024464527757832891.023
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:14alpertronManual testing5000001500000012-
skipped known factor: 3905327
--0.101--5.108%


Trial Factoring results:
No TF results for M1952663


ECM factoring results:

Old Calculation Method

Total ECM effort:21.052 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:21.052 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
201100010.6220.002%
25500001.00436.645%
302500000.06493.799%
3510000000.00399.699%


ECM Summary

B1B2factorcurvesGHz-days
500005000000251.740
50000500000020.139
50000675000070.556
50000690000070.562
50000750000021618.06


Lucas-Lehmer results:
No L-L results for M1952663


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T05:51:50Oliver KruseGTX-0
3905327
52C520ED25D75C__no
2017-11-11T14:17:39kkmrkkblmbrbkc4.xlarge
3905327
52C520ED25D75C__no
2021-02-23T21:25:36Cork3tits
3905327
643997908213602201929
E6902D81501B05B9no


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
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2022-05-12T09:17:48+00:00