is 2 1888409 - 1
has 568468 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA69BCD7A508FCB0Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.734968.6567%500000150000000.10155.0878%15.836470.2514%1.5947%
PrimeNet2570.010263.1579%90001600000.00143.0346%0.011564.2759%1.1180%
GPU722610.162765.5738%100001500000.00141.6929%0.164166.1566%0.5828%
Difference+6+15.5722+3.0829%+490000+14850000+0.1001+3.3948%+15.6723+4.0948%+4.0948%

Known prime factors (1 factor, 75.9 bits, 0.00402008% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1888409712666562556168026731372375.91618869497088717752
23 × 61 × 38667002230979
2008-11-0261386670022309796,834.2165,717309,513

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:27alpertronManual testing5000001500000012---0.101--5.088%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.702 GHz-days
Estimated T-Level:24.554
DigitsB1CurvesCompleteFacMiss
2011000255 / 1002.5507.709%
2550000255 / 2800.91140.158%

New Calculation Method

Total ECM effort:19.702 GHz-days
Estimated T-Level:24.554
DigitsB1CompleteFacMiss
201100010.5350.003%
25500000.97037.924%
302500000.06294.030%
3510000000.00399.711%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000281.941
50000660000021316.65
500006750000141.106


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00ANONYMOUSv4_computersA69BCD7A508FCB0E0.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T15:37:06Oliver KruseGTX-1
71266656255616802673137
C3BF63794E1603__no
2017-11-08T14:22:42kkmrkkblmbrbkc4.xlarge
71266656255616802673137
C3BF63794E1603__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-11-19T10:18:46+00:00