is 2 1952689 - 1
has 587818 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
Actual26715.216968.6567%500000150000000.10155.1083%15.318470.2578%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+14.9023+2.5277%+492000+14910000+0.1005+3.9549%+15.0028+3.7381%+3.7381%

Known prime factors (2 factors, 100.5 bits, 0.00514668% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1952689874804673929.704224
25 × 7
-32323.840e-112.517e-65.123e-6
195268920472970679280865825192270.794524225073201131
27691 × 18931243841
2020-11-242769118931243841124.2581.137151.54

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1952689179098504204268857033622131128731100.499
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:14alpertronManual testing5000001500000012-
skipped known factor: 874804673
--0.101--5.108%


Trial Factoring results:
No TF results for M1952689


ECM factoring results:

Old Calculation Method

Total ECM effort:20.936 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:20.936 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110009.0420.012%
25500000.80444.750%
302500000.05095.137%
3510000000.00299.771%


ECM Summary

B1B2factorcurvesGHz-days
500005000000362.505
50000500000010.070
50000675000070.556
50000750000021317.81


Lucas-Lehmer results:
No L-L results for M1952689


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T06:03:56Oliver KruseGTX-3
874804673
FD017CDA306BAA__no
2017-11-11T14:16:06kkmrkkblmbrbkc4.xlarge
874804673
FD017CDA306BAA__no
2020-11-24T15:26:45mrhx
874804673
2047297067928086582519
59CE69BA37F3D648no


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
TF factor-bounds graph:
267
220
230
240
250
260
270
280
290
2100
Last modified: 2022-05-12T09:17:49+00:00