is 2 2515039 - 1
has 757103 decimal digits
takes 0.174 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LECF244B72AC7AA29double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.699467.6471%45000002100000001.57869.0680%25.278070.5808%2.9338%
PrimeNet2590.030562.7119%110001900000.00212.6419%0.032663.6970%0.9851%
GPU722630.634665.0794%110001700000.00201.4092%0.636665.5715%0.4921%
Difference+5+23.0648+2.5677%+4489000+209830000+1.5766+7.6588%+24.6414+5.0094%+5.0094%

Known prime factors (1 factor, 69.0 bits, 0.00274357% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25150395910073513462197579532169.002117494669336384
26 × 1835854208381
2020-06-2964183585420838176.32210,06018,789

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.235%
2003-10-31T00:00:00Team Prime Ribv4_computers15000236250---0.003--0.796%
2010-12-19T21:41:00Jocelyn LaroucheManual testing2000020000---0.002--0.264%
2011-01-01T13:19:00Jocelyn LaroucheManual testing3000030000---0.003--0.366%
2011-01-06T01:06:00Jocelyn LaroucheManual testing5000050000---0.005--0.529%
2011-03-03T20:15:00James Heinrichi7-9203000008000000---0.072--3.953%
2017-11-01T21:31:22Jocelyn Larouchelow 4M60000060000006---0.090--4.043%
2018-04-14T22:45:36mikrMSI300000013500000012---1.025--8.254%
2018-05-13T13:43:19mikrS061450000021000000012---1.579--9.068%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-31T02:09:00Sturle Sundedanzi.ifi260261--0.061--
2012-06-13T08:42:00Sebastian HornbostelManual testing261262--0.122--
2013-01-23T08:30:00dbaughManual testing262263--0.390--
2015-02-18T11:36:00VictordeHollanderManual testing263264--0.781--
2015-02-18T11:36:00VictordeHollanderManual testing264265--1.486--
2015-11-05T09:47:23ramgeisManual testing265266--2.971--
2017-07-31T22:29:10Gordon SpenceManual testing266267--5.942--
2019-05-06T12:23:25TJAOIManual testing267268--11.88--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.957 GHz-days
Estimated T-Level:2.150
DigitsB1CurvesCompleteFacMiss
201100043 / 1000.43064.910%
255000043 / 2800.15485.740%

New Calculation Method

Total ECM effort:3.957 GHz-days
Estimated T-Level:2.150
DigitsB1CompleteFacMiss
20110001.38724.980%
25500000.12588.218%
302500000.00899.231%


ECM Summary

B1B2factorcurvesGHz-days
500005000000413.773
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-23T00:00:00ANONYMOUSv4_computersECF244B72AC7AA290.174
2018-06-05T00:43:02kkmrkkblmbrbkoldECF244B72AC7AA290.174


PRP results:
dateuseridcompidcofactorsres64PRP
2020-06-29T10:05:16CrypticClueManual testing
591007351346219757953
8B3DAC520C1AE9B5no
2020-06-30T08:01:50marssystemsSYSTEM01
591007351346219757953
8B3DAC520C1AE9B5no


P-1 factor-bounds graph:
B1 = 4500000, B2 = 210000000 (P-1 stage 2)
B1 = 3000000, B2 = 135000000 (P-1 stage 2)
B1 = 4500000 (P-1 stage 1)
B1 = 3000000 (P-1 stage 1)
B1 = 600000, B2 = 6000000 (P-1 stage 2)
B1 = 300000, B2 = 8000000 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (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: 2020-06-30T08:01:50+00:00