is 2 19253497 - 1
has 5795881 decimal digits
takes 12.274 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L814DB0D6060BA083double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2696.200863.7681%23000056350000.48484.1716%6.685665.2796%1.5115%
PrimeNet2650.378961.5385%9000028000000.21974.8413%0.598663.4005%1.8621%
GPU722696.200863.7681%14000040000000.32383.6084%6.524665.0755%1.3074%
Difference---+90000+1635000+0.1610+0.5632%+0.1610+0.2041%+0.2041%

Known prime factors (1 factor, 75.5 bits, 0.00039209% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19253497531019886058202308565372375.4911379021914975244
22 × 383 × 733 × 1228028449
2019-11-037331228028449788.3361.847115.51

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-05-11T00:00:00ANONYMOUSv4_computers2300005635000---0.485--4.172%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-10-27T00:00:00Net_Forcev4_computers21258--0.002--
2002-02-10T00:00:00Net_Forcev4_computers21259--0.004--
2002-06-02T00:00:00ANONYMOUSv4_computers21266--0.767--
2014-06-15T08:27:00NesowaManual testing266267--0.776--
2014-06-15T08:27:00NesowaManual testing267268--1.552--
2017-11-22T10:58:59ramgeisManual testing268269--3.105--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.969 GHz-days
Estimated T-Level:0.050
DigitsB1CurvesCompleteFacMiss
20110001 / 1000.01099.000%
25500001 / 2800.00499.643%

New Calculation Method

Total ECM effort:0.969 GHz-days
Estimated T-Level:0.050
DigitsB1CompleteFacMiss
20110000.03296.826%
25500000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.969


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2003-05-26T00:00:00ANONYMOUSv4_computers814DB0D6060BA08312.27
2007-04-23T00:00:00TheJudgerv4_computers814DB0D6060BA08312.27


PRP results:
No PRP results for M19253497


P-1 factor-bounds graph:
B1 = 230000, B2 = 5635000 (P-1 stage 2)
B1 = 230000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-11-03T05:37:08+00:00