is 2 2062477 - 1
has 620868 decimal digits
takes 0.136 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
Actual26714.406968.6567%500000150000000.12305.1420%14.529970.2684%1.6117%
PrimeNet2580.018663.7931%90001600000.00162.6687%0.020364.7594%0.9662%
GPU722620.297966.1290%90001300000.00151.3653%0.299466.5915%0.4625%
Difference+5+14.1090+2.5277%+491000+14870000+0.1215+3.7767%+14.2305+3.6769%+3.6769%

Known prime factors (2 factors, 91.5 bits, 0.00443405% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2062477144373391927.10535
5 × 7
-578.735e-124.871e-79.701e-7
2062477234472536896007479992064.3465684246100587
5684246100587
2017-09-18156842461005873.226429,52555,145

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
206247733851595248049214247520946092891.451
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T13:42:51alpertronManual testing5000001500000012-
skipped known factor: 144373391
--0.123--5.142%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2017-09-18T11:06:21TJAOIManual testing264265*64.346201.5010.2753.047


ECM factoring results:

Old Calculation Method

Total ECM effort:3.552 GHz-days
Estimated T-Level:1.700
DigitsB1CurvesCompleteFacMiss
201100034 / 1000.34071.055%
255000034 / 2800.12188.546%

New Calculation Method

Total ECM effort:3.552 GHz-days
Estimated T-Level:1.700
DigitsB1CompleteFacMiss
20110001.42823.980%
25500000.13187.723%
302500000.00899.176%


ECM Summary

B1B2factorcurvesGHz-days
500005000070.355
50000500000060.509
50000576289770.631
500006750000141.358
50000715000070.698


Lucas-Lehmer results:
No L-L results for M2062477


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T11:10:40Oliver KruseGTX-0
144373391
23447253689600747999
D255AF8A9769FE__no
2017-11-16T00:44:13kkmrkkblmbrbkc4.xlarge
144373391
23447253689600747999
D255AF8A9769FE__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: 2022-07-04T11:46:22+00:00