is 2 1842251 - 1
has 554573 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26716.129168.6567 %50000018672954308.03999.9374 %24.169171.7714 %
Target2610.166765.5738 %90007000000.00371.5968 %0.170466.1235 %
Difference+6+15.9624+3.0829 %+491000+1866595430+8.0363+8.3406%+23.9987+5.6479 %

Known prime factors (2 factors, 86.2 bits, 0.00467720% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1842251933837031911136.44225345
5 × 37 × 137
-371377.384e-93.339e-65.923e-6
18422519294274788584331549.723252253216
25 × 739 × 10667
2008-08-26739106675.142e-50.00010.0001

1 Composite Factors:
P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2022-03-17Lisander ViaeneDesktop5000001867295430
skipped known factor: 93383703191
skipped known factor: 929427478858433
--9.7415.780%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2008-08-26ANONYMOUSManual testing??
49.723
15
6.79933e-5


ECM factoring results:
Total ECM effort:39.370 GHz-days
Estimated T-Level:25.712
DigitsB1CompleteFacMiss
201100015.0430.000%
25500001.68618.521%
302500000.14286.725%
3510000000.01099.028%


ECM Summary

B1B2factorcurvesGHz-days
500005000000362.488
50000660000021516.76
250000400000004720.13


Lucas-Lehmer results:
No L-L results for M1842251


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
93383703191
929427478858433
CD73D0E10B3EBFAB
2017-11-06kkmrkkblmbrbkc4.xlarge
93383703191
929427478858433
CD73D0E10B3EBFAB


CERT results:
No CERT results for M1842251


P-1 factor-bounds graph:
B1 = 500000, B2 = 1867295430 (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
TF factor-bounds graph:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00