is 2 2017397 - 1
has 607298 decimal digits
takes 0.133 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEB0402072DBDEA6Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.728868.6567%640000140800000.13085.2102%14.859770.2898%1.6330%
PrimeNet2580.019063.7931%90001500000.00162.6113%0.020664.7386%0.9455%
GPU722620.304566.1290%80001200000.00131.2730%0.305966.5602%0.4312%
Difference+5+14.4243+2.5277%+632000+13960000+0.1295+3.9372%+14.5538+3.7296%+3.7296%

Known prime factors (1 factor, 72.5 bits, 0.00359244% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
201739765582526268074192232492272.4741625424402536392
23 × 203178050317049
2017-10-028203178050317049694.891,055,3581,971,114

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.022%
2002-05-05T00:00:00Jocelyn Larouchev4_computers30003000---0.000--0.040%
2003-02-02T00:00:00ANONYMOUSv4_computers30000547500---0.006--1.426%
2010-12-07T03:13:00Jocelyn LaroucheManual testing201739201739---0.019--1.331%
2013-10-16T14:25:00David Campeaui5-2500k64000014080000---0.131--5.210%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:03Mark RoseManual testing258260--0.057--
2009-01-03T01:40:00Sturle Sundedoak.ifi260261--0.076--
2012-02-03T21:47:00Sebastian HornbostelManual testing261262--0.152--
2013-06-06T07:18:00David CampeauManual testing262263--0.487--
2015-03-15T12:12:00VictordeHollanderManual testing263264--0.973--
2015-03-15T12:12:00VictordeHollanderManual testing264265--1.852--
2015-10-28T09:42:37ramgeisManual testing265266--3.704--
2016-07-16T16:15:45Gordon SpenceManual testing266267--7.408--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.129 GHz-days
Estimated T-Level:4.800
DigitsB1CurvesCompleteFacMiss
201100096 / 1000.96038.105%
255000096 / 2800.34370.930%

New Calculation Method

Total ECM effort:8.129 GHz-days
Estimated T-Level:4.800
DigitsB1CompleteFacMiss
20110003.6922.491%
25500000.34271.061%
302500000.02297.868%
3510000000.00199.899%


ECM Summary

B1B2factorcurvesGHz-days
500005000000332.794
500005000000635.334


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00ANONYMOUSv4_computersEB0402072DBDEA6D0.133
2016-07-15T12:06:15Mark RoseleonardoEB0402072DBDEA6D0.133


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T23:04:34Oliver KruseGTX-3
6558252626807419223249
FCC3EC478C2255__no
2017-11-13T22:00:56kkmrkkblmbrbkc4.xlarge
6558252626807419223249
FCC3EC478C2255__no


P-1 factor-bounds graph:
B1 = 640000, B2 = 14080000 (P-1 stage 2)
B1 = 640000 (P-1 stage 1)
B1 = 201739 (P-1 stage 1)
B1 = 30000, B2 = 547500 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 3000 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-11-13T22:00:56+00:00