is 2 2572699 - 1
has 774460 decimal digits
takes 0.178 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7EF10D60C7B667EBdouble-checked
PRP5CCBE53055DA9740verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.168267.6471%32000001120000000.91808.0799%24.086270.2611%2.6141%
PrimeNet2590.029962.7119%110002000000.00212.6896%0.032063.7148%1.0029%
GPU722630.620465.0794%120001900000.00221.5044%0.622565.6047%0.5254%
Difference+5+22.5479+2.5677%+3188000+111810000+0.9158+6.5754%+23.4637+4.6564%+4.6564%

Known prime factors (1 factor, 70.8 bits, 0.00275232% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
257269920683340965017501884092270.809401977475114996
22 × 11 × 9135851707159
2020-10-04119135851707159162.8150,06093,498

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.237%
2003-11-08T00:00:00Team Prime Ribv4_computers15000202500---0.003--0.762%
2010-12-21T11:03:00Jocelyn LaroucheManual testing2000020000---0.002--0.265%
2011-01-10T23:58:00Jocelyn LaroucheManual testing5000050000---0.005--0.532%
2011-04-17T10:03:00James HeinrichWHS1750004112500---0.039--3.173%
2016-06-20T09:23:53mikrMSI320000011200000012---0.918--8.080%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-26T00:00:00ANONYMOUSv4_computers21259--0.030--
2016-02-23T16:29:16Mark RoseManual testing259260--0.030--
2009-01-31T12:01:00Sturle Sundeginy.ifi260261--0.060--
2012-06-19T07:42:00Sebastian HornbostelManual testing261262--0.119--
2013-01-14T11:55:00dbaughManual testing262263--0.382--
2015-02-23T17:24:00VictordeHollanderManual testing263264--0.763--
2015-02-23T17:24:00VictordeHollanderManual testing264265--1.452--
2015-11-08T21:03:04ramgeisManual testing265266--2.905--
2017-08-20T12:59:32Gordon SpenceManual testing266267--5.809--
2019-09-03T13:43:04YxinityManual testing267268--11.62--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.555 GHz-days
Estimated T-Level:3.550
DigitsB1CurvesCompleteFacMiss
201100071 / 1000.71048.989%
255000071 / 2800.25477.567%

New Calculation Method

Total ECM effort:6.555 GHz-days
Estimated T-Level:3.550
DigitsB1CompleteFacMiss
20110002.29010.123%
25500000.20781.302%
302500000.01398.733%


ECM Summary

B1B2factorcurvesGHz-days
500005000000645.909
50000500000070.646


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00ANONYMOUSv4_computers7EF10D60C7B667EB0.178
2000-01-04T00:00:00ANONYMOUSv4_computers7EF10D60C7B667EB0.178
2018-06-17T04:39:03kkmrkkblmbrbkold7EF10D60C7B667EB0.178


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-04T09:15:42SRJ2877
2068334096501750188409
5CCBE53055DA9740no


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 175000, B2 = 4112500 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 15000, B2 = 202500 (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: 2020-10-04T09:15:42+00:00