is 2 1901299 - 1
has 572349 decimal digits
takes 0.103 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
Actual26715.628268.6567 %500000150000000.10155.0920 %15.729770.2527 %
Target2610.161665.5738 %100008000000.00421.7276 %0.165766.1685 %
Difference+6+15.4667+3.0829 %+490000+14200000+0.0973+3.3644%+15.5640+4.0842 %

Known prime factors (1 factor, 32.3 bits, 0.00169919% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
190129953122294071032.3071397
11 × 127
-111273.919e-101.362e-61.761e-6

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2016-03-16alpertronManual testing5000001500000012
skipped known factor: 5312229407
---8.901%


Trial Factoring results:
5758596061626364656667
No TF results for M1901299


ECM factoring results:
Total ECM effort:39.508 GHz-days
Estimated T-Level:25.711
DigitsB1CompleteFacMiss
201100015.0140.000%
25500001.68418.570%
302500000.14286.738%
3510000000.01099.029%


ECM Summary

B1B2factorcurvesGHz-days
500005000000322.220
50000660000021116.51
50000675000070.554
250000400000004720.22


Lucas-Lehmer results:
No L-L results for M1901299


PRP results:
dateuseridcompidcofactorsres64
2017-10-04Oliver KruseGTX-1
5312229407
3DDD830BA41E6F9F
2017-11-09ATHec2-1xh
5312229407
3DDD830BA41E6F9F


CERT results:
No CERT results for M1901299


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:
this exponent TF target: 61
TF double-checked to: 67
ECM T-Level=25.71 ~= 69-bit
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270
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Last modified: 2024-03-13T02:15:48+00:00