is 2 2738017 - 1
has 824226 decimal digits
takes 0.211 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L287A07663C1C6911double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.852367.1642%18500046250000.04783.6932%10.900268.3769%1.2127%
PrimeNet2590.028062.7119%120002200000.00262.8502%0.030763.7747%1.0628%
GPU722630.582965.0794%140002400000.00291.7076%0.585965.6757%0.5963%
Difference+4+10.2694+2.0848%+171000+4385000+0.0449+1.9856%+10.3143+2.7012%+2.7012%

Known prime factors (1 factor, 73.6 bits, 0.00268666% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2738017139354998163388432061112373.5612544816160078415
5 × 71 × 7168496225573
2013-02-227171684962255731,384.543,74081,694

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-16T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.299%
2003-11-28T00:00:00Team Prime Ribv4_computers15000225000---0.003--0.933%
2010-12-19T21:43:00Jocelyn LaroucheManual testing2000020000---0.002--0.321%
2010-12-29T20:12:00Jocelyn LaroucheManual testing3000030000---0.003--0.439%
2011-01-20T22:46:00Jocelyn LaroucheManual testing5000050000---0.006--0.629%
2011-04-27T07:10:00James HeinrichWHS1850004625000---0.048--3.693%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2009-01-28T04:32:00Sturle Sundepapageno.ifi260261--0.056--
2012-04-09T19:54:00Grant McCrackenthumper261262--0.112--
2013-01-14T12:27:00dbaughManual testing262263--0.359--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.623 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:0.623 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.23179.392%
25500000.02197.887%
302500000.00199.865%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000060.623


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-07-12T00:00:00ANONYMOUSv4_computers287A07663C1C69110.211


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-20T06:41:00Oliver KruseGTX-3
13935499816338843206111
868ECAA8FC0970__no
2017-12-05T11:33:19kkmrkkblmbrbkc4.xlarge
13935499816338843206111
868ECAA8FC0970__no


P-1 factor-bounds graph:
B1 = 185000, B2 = 4625000 (P-1 stage 2)
B1 = 185000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 225000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-12-05T11:33:19+00:00