is 2 1866869 - 1
has 561984 decimal digits
takes 0.101 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
Actual26715.916468.6567%500000150000000.10155.0808%16.017970.2492%1.5925%
PrimeNet2570.010363.1579%90001600000.00143.0282%0.011664.2735%1.1156%
GPU722610.164565.5738%100001500000.00141.6891%0.165966.1553%0.5815%
Difference+6+15.7519+3.0829%+490000+14850000+0.1001+3.3917%+15.8520+4.0939%+4.0939%

Known prime factors (2 factors, 127.8 bits, 0.00684424% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18668691026979113012937191856.51127505387711
17 × 1617963983
-1716179639830.00586.934212.951
186686928309928422097939994492271.262758219468588796
22 × 3 × 63184955715733
2020-12-23463184955715733464.36270,795505,770

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
186686929073705180385882937551646335687316083139127.773
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:37:38alpertronManual testing5000001500000012---0.101--5.081%


Trial Factoring results:
No TF results for M1866869


ECM factoring results:

Old Calculation Method

Total ECM effort:19.744 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.744 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.7960.015%
25500000.79745.076%
302500000.04995.191%
3510000000.00299.774%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.284
500005000000120.831
50000660000021316.63


Lucas-Lehmer results:
No L-L results for M1866869


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T10:30:48Oliver KruseGTX-0
102697911301293719
4A676810478AA1__no
2017-11-07T12:33:41kkmrkkblmbrbkc4.xlarge
102697911301293719
4A676810478AA1__no
2020-12-23T19:24:50Maciej KmieciakAsrock
102697911301293719
2830992842209793999449
4242ADFE5DC0EFE8no


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: 2021-09-03T14:08:13+00:00