is 2 1756021 - 1
has 528615 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-L9A10D33AFB8693ADdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.921268.6567%36422001234567890.80008.6384%17.721271.3643%2.7075%
PrimeNet2570.010963.1579%80001400000.00122.8043%0.012164.1911%1.0332%
GPU722610.174965.5738%80001100000.00111.4137%0.176066.0604%0.4867%
Difference+6+16.7462+3.0829%+3634200+123346789+0.7989+7.2247%+17.5452+5.3038%+5.3038%

Known prime factors (1 factor, 78.7 bits, 0.00447931% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17560214767909452067641917314472478.658135758896165468463
125837749 × 1078840787
2016-10-06125837749107884078738,65613.98320.146

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:28:00Carsten Kossendeyleela950001567500---0.014--2.412%
2014-04-08T23:01:00Jocelyn LaroucheManual testing100000100000---0.008--0.888%
2014-05-06T21:05:00Jocelyn LaroucheManual testing136551136551---0.011--1.059%
2014-09-17T22:20:00ANONYMOUSManual testing173102173102---0.014--1.202%
2015-04-26T02:51:00Squeeky_SquirrelP4_26001300003640000---0.025--3.108%
2015-07-06T16:46:00mikrMSI3642200123456789---0.800--8.638%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-22T13:21:00Architects Cubedi4l_1260261--0.087--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.909--
2016-02-23T16:28:50Mark RoseManual testing262263--0.559--
2015-05-14T02:58:00snme2pm1Manual testing263264--1.118--
2015-05-14T02:58:00snme2pm1Manual testing264265--2.128--
2015-09-06T20:47:00ramgeisManual testing265266--4.255--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.258 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.258 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024917.12
50000500000020.138


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers9A10D33AFB8693AD0.095
2015-07-18T19:04:00MadPooManual testing9A10D33AFB8693AD0.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T08:00:04Oliver KruseGTX-1
476790945206764191731447
5A91EFDB339470__no
2017-11-04T03:39:08kkmrkkblmbrbkold
476790945206764191731447
5A91EFDB339470__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 = 1567500 (P-1 stage 2)
B1 = 173102 (P-1 stage 1)
B1 = 136551 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
103
104
105
106
107
108
109
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
250
260
270
280
290
2100
Last modified: 2020-07-27T11:05:45+00:00