is 2 1748269 - 1
has 526282 decimal digits
takes 0.095 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD6E45E15A3DDFEC4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.996268.6567%36422001234567890.80008.6347%17.796271.3631%2.7064%
PrimeNet2570.011063.1579%80001400000.00122.8019%0.012264.1902%1.0323%
GPU722610.175765.5738%80001100000.00111.4124%0.176866.0600%0.4862%
Difference+6+16.8205+3.0829%+3634200+123346789+0.7989+7.2223%+17.6194+5.3031%+5.3031%

Known prime factors (1 factor, 81.0 bits, 0.00463244% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
174826923969939774776353033829692580.988685533512713900236
22 × 3 × 31 × 82891 × 22231991693
2016-10-028289122231991693268,48395.287177.96

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-10T11:16:00Carsten Kossendeyleela950001543750---0.014--2.401%
2014-04-08T23:00:00Jocelyn LaroucheManual testing100000100000---0.008--0.887%
2014-05-06T10:53:00Jocelyn LaroucheManual testing136713136713---0.011--1.059%
2014-09-15T22:12:00ANONYMOUSManual testing173426173426---0.014--1.202%
2015-04-23T17:04:00Squeeky_SquirrelP4_26001300003640000---0.025--3.106%
2015-06-19T04:31:00mikrMSI3642200123456789---0.800--8.635%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-22T12:47:00Architects Cubedm1_fw260261--0.088--
2016-02-23T16:28:50Mark RoseManual testing261262--0.176--
2010-11-18T02:51:00GrunwalderGIMPManual testing21263--0.913--
2016-02-23T16:28:50Mark RoseManual testing262263--0.562--
2015-05-13T05:09:00snme2pm1Manual testing263264--1.123--
2015-05-13T05:09:00snme2pm1Manual testing264265--2.137--
2015-09-05T13:49:00ramgeisManual testing265266--4.274--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.249 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.249 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025017.18
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13T00:00:00ANONYMOUSv4_computersD6E45E15A3DDFEC40.095
2016-06-02T10:52:42MadPooManual testingD6E45E15A3DDFEC40.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T06:02:25Oliver KruseGTX-1
2396993977477635303382969
86DCF913C3D79F__no
2017-11-03T21:11:40kkmrkkblmbrbkold
2396993977477635303382969
86DCF913C3D79F__no


P-1 factor-bounds graph:
B1 = 3642200, B2 = 123456789 (P-1 stage 2)
B1 = 3642200 (P-1 stage 1)
B1 = 130000, B2 = 3640000 (P-1 stage 2)
B1 = 95000, B2 = 1543750 (P-1 stage 2)
B1 = 173426 (P-1 stage 1)
B1 = 136713 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
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105
106
107
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2020-07-27T10:58:54+00:00