is 2 1750447 - 1
has 526938 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-L0C70FA223870E4F4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.975068.6567%36422001234567890.80008.6357%17.775071.3634%2.7067%
PrimeNet2570.011063.1579%80001400000.00122.8026%0.012264.1904%1.0325%
GPU722610.175565.5738%80001100000.00111.4127%0.176666.0601%0.4864%
Difference+6+16.7996+3.0829%+3634200+123346789+0.7989+7.2230%+17.5985+5.3033%+5.3033%

Known prime factors (2 factors, 165.8 bits, 0.00946951% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1750447353145819227249753254392374.90310087303963708977
3 × 3362434654569659
2017-01-26333624346545696594,228.114,410,55426,914,902
175044722406855514356918309188830472890.856640032389279907312509
29 × 439 × 935819 × 53721431381
2020-07-2793581953721431381225,999,126230.31430.02

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
17504477912887346924192561458962375881900733340920493263350165.759
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T06:19:00Carsten Kossendeyleela950001543750---0.014--2.402%
2014-04-08T23:00:00Jocelyn LaroucheManual testing100000100000---0.008--0.887%
2014-05-06T10:53:00Jocelyn LaroucheManual testing136667136667---0.011--1.059%
2014-09-15T22:12:00ANONYMOUSManual testing173334173334---0.014--1.202%
2015-04-22T05:08:00Squeeky_SquirrelP4_26001300003640000---0.025--3.107%
2015-06-25T09:45:00mikrMSI3642200123456789---0.800--8.636%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-19T03:15:00Architects Cubedi4l_1260261--0.088--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.912--
2016-02-23T16:28:50Mark RoseManual testing262263--0.561--
2015-05-13T11:38:00snme2pm1Manual testing263264--1.122--
2015-05-13T11:38:00snme2pm1Manual testing264265--2.135--
2015-09-05T13:49:00ramgeisManual testing265266--4.269--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.252 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.252 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001107.561
50000500000010.069
5000050000001409.62


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers0C70FA223870E4F40.095
1999-01-02T00:00:00ANONYMOUSv4_computers0C70FA223870E4F40.095
2015-07-18T19:04:00MadPooManual testing0C70FA223870E4F40.095


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-03T06:23:30Oliver KruseGTX-0
35314581922724975325439
7BA56D5D3DFF8C__no
2017-11-03T20:13:35kkmrkkblmbrbkc4.xlarge
35314581922724975325439
7BA56D5D3DFF8C__no
2020-07-27T14:49:57mrh.orgw
35314581922724975325439
2240685551435691830918883047
1BE6DBB4530AB4C5no
2020-07-28T12:03:38pewlaptop
35314581922724975325439
2240685551435691830918883047
1BE6DBB4530AB4C5no


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 = 173334 (P-1 stage 1)
B1 = 136667 (P-1 stage 1)
B1 = 130000 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-07-28T12:03:38+00:00