is 2 2175577 - 1
has 654914 decimal digits
takes 0.143 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6A0CC54F7D73D8B8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26713.657967.1642%500000150000000.12305.1751%13.780968.8635%1.6993%
PrimeNet2580.017662.0690%100001800000.00182.8572%0.019563.1527%1.0838%
GPU722620.282464.5161%110001600000.00181.5681%0.284265.0726%0.5564%
Difference+5+13.3756+2.6481%+489000+14840000+0.1212+3.6070%+13.4967+3.7909%+3.7909%

Known prime factors (1 factor, 73.0 bits, 0.00335554% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
217557794599876477974672329192273.0022174133034086467
157 × 13847981108831
2009-12-05157138479811088311,390.671,930134,345

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-07T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.280%
2016-03-16T13:46:03alpertronManual testing5000001500000012---0.123--5.175%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers21258--0.018--
2000-04-05T00:00:00ANONYMOUSv4_computers21258--0.018--
2002-09-07T00:00:00ANONYMOUSv4_computers21258--0.018--
2022-03-09T16:35:57LordJuliusManual testing21260--0.071--
2009-01-04T17:49:00Sturle Sundeantonov.ifi260261--0.071--
2009-01-06T20:56:00Sturle Sundegonsha.ifi261262--0.141--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.516 GHz-days
Estimated T-Level:0.850
DigitsB1CurvesCompleteFacMiss
201100017 / 1000.17084.294%
255000017 / 2800.06194.099%

New Calculation Method

Total ECM effort:1.516 GHz-days
Estimated T-Level:0.850
DigitsB1CompleteFacMiss
20110000.66551.447%
25500000.06293.988%
302500000.00499.609%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000100.855
50000627698070.661


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00Dry Creek Photov4_computers6A0CC54F7D73D8B80.143


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-09T16:42:47kkmrkkblmbrbkold
9459987647797467232919
0EA83B92C45328__no
2017-10-23T02:49:40Oliver KruseGTX-3
9459987647797467232919
0EA83B92C45328__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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101
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1010
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TF factor-bounds graph:
267
262
261
260
258
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260
270
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2100
Last modified: 2022-06-13T01:38:18+00:00