is 2 2555027 - 1
has 769140 decimal digits
takes 0.177 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L95A1A002B429B029double-checked
PRPBD754B8AB13AFADEverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.328567.6471%32000001120000000.91808.0744%24.246570.2594%2.6123%
PrimeNet2590.030162.7119%110002000000.00212.6862%0.032263.7135%1.0016%
GPU722630.624765.0794%120001800000.00211.4786%0.626865.5957%0.5163%
Difference+5+22.7038+2.5677%+3188000+111820000+0.9159+6.5958%+23.6197+4.6637%+4.6637%

Known prime factors (1 factor, 68.2 bits, 0.00266877% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25550273362089151647755584632168.18865793612976453
65793612976453
2020-10-1216579361297645341.930360,518673,347

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.236%
2003-11-08T00:00:00Team Prime Ribv4_computers15000198750---0.003--0.756%
2010-12-19T21:44:00Jocelyn LaroucheManual testing2000020000---0.002--0.265%
2011-01-03T14:35:00Jocelyn LaroucheManual testing3000030000---0.003--0.367%
2011-01-09T14:30:00Jocelyn LaroucheManual testing5000050000---0.005--0.531%
2011-04-10T01:58:00James HeinrichWHS1750004068750---0.039--3.163%
2016-04-03T06:21:46mikrMSI320000011200000012---0.918--8.074%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.030--
2016-02-23T16:29:16Mark RoseManual testing259260--0.030--
2009-01-31T00:26:00Sturle Sundegorky.ifi260261--0.060--
2011-11-22T10:37:00c10ck3raleman261262--0.120--
2013-10-25T16:27:00lycornsnail262263--0.384--
2015-02-23T17:24:00VictordeHollanderManual testing263264--0.768--
2015-02-23T17:24:00VictordeHollanderManual testing264265--1.462--
2015-11-04T20:25:09omylistManual testing265266--2.925--
2017-08-10T07:53:54Gordon SpenceManual testing266267--5.849--
2019-05-27T13:36:55TJAOIManual testing267268--11.70--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.733 GHz-days
Estimated T-Level:3.650
DigitsB1CurvesCompleteFacMiss
201100073 / 1000.73048.014%
255000073 / 2800.26177.014%

New Calculation Method

Total ECM effort:6.733 GHz-days
Estimated T-Level:3.650
DigitsB1CompleteFacMiss
20110002.3559.491%
25500000.21380.830%
302500000.01398.698%


ECM Summary

B1B2factorcurvesGHz-days
500005000000676.180
50000500000060.553


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-19T00:00:00ANONYMOUSv4_computers95A1A002B429B0290.177
1999-07-30T00:00:00ANONYMOUSv4_computers95A1A002B429B0290.177
2018-06-12T16:11:57kkmrkkblmbrbkold95A1A002B429B0290.177


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-12T15:59:28mrh.orgi
336208915164775558463
BD754B8AB13AFADEno


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 175000, B2 = 4068750 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 198750 (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: 2020-10-12T15:59:28+00:00