is 2 2455979 - 1
has 739324 decimal digits
takes 0.170 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L223E3BEDBA2792A1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.098667.1642%2382500857701000.69658.1876%12.795169.8526%2.6885%
PrimeNet2590.031362.7119%100001800000.00192.5294%0.033263.6550%0.9432%
GPU722630.649865.0794%100001600000.00181.3340%0.651765.5452%0.4658%
Difference+4+11.4488+2.0848%+2372500+85610100+0.6947+6.8536%+12.1435+4.3074%+4.3074%

Known prime factors (1 factor, 82.5 bits, 0.00335931% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
245597968575193250100320855284632582.5041396086718373819989
11 × 151 × 840509764222649
2015-07-10151840509764222649682,7234,605,5978,601,972

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.289%
2003-10-31T00:00:00Team Prime Ribv4_computers15000232500---0.003--0.921%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.313%
2011-01-19T19:34:00Oscar Östlin950001947500---0.020--2.675%
2014-05-19T14:34:00mikrMSI238250085770100---0.697--8.188%
2018-09-28T17:00:46alpertronManual testing20000006000000012---0.519--7.633%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-08T00:00:00ANONYMOUSv4_computers21258--0.016--
1999-04-02T00:00:00ANONYMOUSv4_computers21258--0.016--
1999-08-07T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:52:56LordJuliusManual testing21260--0.063--
2009-01-14T14:45:00Sturle Sundeginy.ifi260261--0.063--
2012-06-07T14:43:00Sebastian HornbostelManual testing261262--0.125--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.400--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.799--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.521--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.192 GHz-days
Estimated T-Level:0.650
DigitsB1CurvesCompleteFacMiss
201100013 / 1000.13087.752%
255000013 / 2800.04695.455%

New Calculation Method

Total ECM effort:1.192 GHz-days
Estimated T-Level:0.650
DigitsB1CompleteFacMiss
20110000.41965.747%
25500000.03896.281%
302500000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.100
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-08T00:00:00ANONYMOUSv4_computers223E3BEDBA2792A10.170
1999-04-02T00:00:00ANONYMOUSv4_computers223E3BEDBA2792A10.170


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T11:36:08kkmrkkblmbrbkc4.xlarge58F756308C55D5__no
2017-11-05T02:46:33Oliver KruseGTX-1
6857519325010032085528463
58F756308C55D5__no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 232500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-10T05:52:56+00:00