is 2 2550949 - 1
has 767913 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-L9CB1841F7E04D129double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.365867.6471%32000001120000000.91808.0731%24.283870.2590%2.6119%
PrimeNet2590.030162.7119%110002000000.00212.6854%0.032263.7132%1.0014%
GPU722630.625765.0794%120001800000.00211.4781%0.627865.5955%0.5162%
Difference+5+22.7401+2.5677%+3188000+111820000+0.9159+6.5950%+23.6560+4.6634%+4.6634%

Known prime factors (1 factor, 75.9 bits, 0.00297583% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2550949710832543140932858552632375.91213932707849920419
3 × 7 × 151 × 4393789924289
2020-07-1015143937899242895,713.024,07644,967

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%
2011-01-09T14:30:00Jocelyn LaroucheManual testing5000050000---0.005--0.531%
2011-04-08T08:05:00James HeinrichWHS1750004068750---0.039--3.162%
2016-03-16T03:17:19mikrMSI320000011200000012---0.918--8.073%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.030--
2016-02-23T16:29:16Mark RoseManual testing259260--0.030--
2009-01-31T20:55:00Sturle Sundegopher.ifi260261--0.060--
2012-06-16T13:43:00Sebastian HornbostelManual testing261262--0.120--
2013-01-14T11:53:00dbaughManual testing262263--0.385--
2015-02-23T17:24:00VictordeHollanderManual testing263264--0.770--
2015-02-23T17:24:00VictordeHollanderManual testing264265--1.465--
2015-11-02T23:17:14omylistManual testing265266--2.929--
2017-08-10T07:53:53Gordon SpenceManual testing266267--5.859--
2019-07-31T09:42:04TJAOIManual testing267268--11.72--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.057 GHz-days
Estimated T-Level:2.200
DigitsB1CurvesCompleteFacMiss
201100044 / 1000.44064.261%
255000044 / 2800.15785.434%

New Calculation Method

Total ECM effort:4.057 GHz-days
Estimated T-Level:2.200
DigitsB1CompleteFacMiss
20110001.69218.409%
25500000.15785.506%
302500000.01099.017%


ECM Summary

B1B2factorcurvesGHz-days
500005000000423.873
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-22T00:00:00HPS_APv4_computers9CB1841F7E04D1290.177
2018-06-12T00:59:50kkmrkkblmbrbkold9CB1841F7E04D1290.177


PRP results:
dateuseridcompidcofactorsres64PRP
2020-07-11T02:18:06pew10980xe_1
71083254314093285855263
86BD763CE6348767no
2020-07-13T22:45:09nordisweet16
71083254314093285855263
86BD763CE6348767no


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 = 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: 2020-07-13T22:45:09+00:00