is 2 2586767 - 1
has 778695 decimal digits
takes 0.179 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
Actual26711.486967.1642%2000000600000000.51907.6739%12.005969.6840%2.5198%
PrimeNet2590.029762.7119%110002000000.00212.6924%0.031863.7158%1.0039%
GPU722630.617065.0794%120001900000.00221.5061%0.619265.6053%0.5259%
Difference+4+10.8699+2.0848%+1988000+59810000+0.5168+6.1679%+11.3867+4.0787%+4.0787%

Known prime factors (2 factors, 125.3 bits, 0.00484532% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
258676758267494315150491652.3721126260972
22 × 32 × 79 × 131 × 3023
-13130230.00032.902e-53.092e-5
258676792221645051250730571512272.9661782565748118225
32 × 52 × 7 × 1131787776583
2018-03-22251131787776583714.266,201.711,583

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
25867675373524178757578262578818348409356539938125.337
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-04T12:41:41alpertronManual testing20000006000000012-
skipped known factor: 5826749431515049
--0.519--7.674%


Trial Factoring results:
No TF results for M2586767


ECM factoring results:

Old Calculation Method

Total ECM effort:0.462 GHz-days
Estimated T-Level:0.250
DigitsB1CurvesCompleteFacMiss
20110005 / 1000.05095.099%
25500005 / 2800.01898.227%

New Calculation Method

Total ECM effort:0.462 GHz-days
Estimated T-Level:0.250
DigitsB1CompleteFacMiss
20110000.19282.505%
25500000.01898.236%
302500000.00199.888%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.277
50000500000020.185


Lucas-Lehmer results:
No L-L results for M2586767


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T12:04:15Oliver KruseGTX-0
5826749431515049
8D43DBA874F138__no
2017-12-02T04:31:01kkmrkkblmbrbkc4.xlarge
5826749431515049
8D43DBA874F138__no
2018-03-24T12:25:55Oliver KruseGTX-5
5826749431515049
9222164505125073057151
8D43DBA874F138__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-08-27T13:06:33+00:00