is 2 1757417 - 1
has 529036 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-L73CB2958001E2D5Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.916269.1176%17574171933158700.95928.0069%34.875471.5904%2.4727%
PrimeNet2570.010963.1579%80001400000.00122.8047%0.012164.1912%1.0333%
GPU722610.174865.5738%80001100000.00111.4139%0.175966.0605%0.4868%
Difference+7+33.7414+3.5439%+1749417+193205870+0.9581+6.5930%+34.6995+5.5298%+5.5298%

Known prime factors (1 factor, 88.7 bits, 0.00504579% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
17574174943461201500259105914250012788.676140645652155984012500
22 × 55 × 181 × 62163824157341
2020-04-2731256216382415734151,728,247266,419497,596

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-07T12:35:00Carsten Kossendeyleela950001567500---0.014--2.137%
2014-04-08T23:01:00Jocelyn LaroucheManual testing100000100000---0.008--0.770%
2014-05-09T20:31:00Jocelyn LaroucheManual testing136522136522---0.011--0.923%
2014-09-17T22:20:00ANONYMOUSManual testing173044173044---0.014--1.052%
2015-04-27T13:16:00mikrMSI247540086660000---0.556--7.322%
2018-08-13T11:55:06Jocelyn Larouchelow 4M175741717574170012---0.884--7.899%
2018-10-19T02:38:29Jocelyn Larouchelow 4M175741719331587012---0.959--8.007%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.066--
2010-04-23T09:17:00Architects Cubedi4l_1260261--0.087--
2016-02-23T16:28:50Mark RoseManual testing261262--0.175--
2011-01-21T16:10:00GrunwalderGIMPManual testing21263--0.908--
2016-02-23T16:28:50Mark RoseManual testing262263--0.559--
2015-05-14T02:58:00snme2pm1Manual testing263264--1.117--
2015-05-14T02:58:00snme2pm1Manual testing264265--2.126--
2015-09-06T20:47:00ramgeisManual testing265266--4.252--
2018-05-21T16:49:47TJAOIManual testing266267--8.504--
2019-06-17T12:15:04TJAOIManual testing267268--17.01--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.465 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:17.465 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
20110008.1940.028%
25500000.74147.686%
302500000.04695.542%
3510000000.00299.791%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025317.40
50000500000010.069


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computers73CB2958001E2D5B0.095
2015-07-01T17:35:00MadPooManual testing73CB2958001E2D5B0.095


PRP results:
dateuseridcompidcofactorsres64PRP
2020-04-27T19:35:50atrenchDesktop
494346120150025910591425001
576B8BB5DD21701Fno
2020-04-28T05:58:38Yuji Hasegawavj22m
494346120150025910591425001
576B8BB5DD21701Fno


P-1 factor-bounds graph:
B1 = 1757417, B2 = 193315870 (P-1 stage 2)
B1 = 1757417, B2 = 175741700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1757417 (P-1 stage 1)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 173044 (P-1 stage 1)
B1 = 136522 (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: 2020-08-14T09:28:58+00:00