is 2 2872417 - 1
has 864684 decimal digits
takes 0.222 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L24A4525BAB321A04double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.344667.1642%15306527830000.03323.2300%10.377868.2248%1.0606%
PrimeNet2590.026762.7119%130002400000.00282.9970%0.029663.8294%1.1175%
GPU722630.555665.0794%160002800000.00341.8698%0.559065.7323%0.6530%
Difference+4+9.7889+2.0848%+137065+2503000+0.0298+1.3601%+9.8187+2.4924%+2.4924%

Known prime factors (1 factor, 74.6 bits, 0.00259827% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2872417292942206016536540604872374.6335099228385302979
33 × 37 × 43 × 118705412047
2016-09-11431187054120472,554.1724.301,352.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-28T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.303%
2009-07-03T00:54:00Carsten Kossendeyleela15000161250---0.003--0.847%
2010-12-23T00:29:00Jocelyn LaroucheManual testing2000020000---0.002--0.324%
2011-01-03T22:20:00Jocelyn LaroucheManual testing3000030000---0.003--0.444%
2011-01-22T13:10:00Jocelyn LaroucheManual testing5000050000---0.006--0.635%
2011-02-05T20:26:00markrtiny1150002530000---0.028--3.013%
2016-09-15T03:47:43Jocelyn Larouchelow 4M15306527830006---0.033--3.230%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:23Mark RoseManual testing21260--0.053--
2009-02-13T04:14:00Sturle Sundegorky.ifi260261--0.053--
2012-01-27T05:27:00Grant McCrackenthumper261262--0.107--
2013-01-10T10:24:00dbaughManual testing262263--0.342--
2015-04-21T09:21:00VictordeHollanderManual testing263264--0.684--
2015-04-21T09:21:00VictordeHollanderManual testing264265--1.301--
2016-02-18T12:13:59ramgeisManual testing265266--2.602--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.465 GHz-days
Estimated T-Level:0.700
DigitsB1CurvesCompleteFacMiss
201100014 / 1000.14086.875%
255000014 / 2800.05095.114%

New Calculation Method

Total ECM effort:1.465 GHz-days
Estimated T-Level:0.700
DigitsB1CompleteFacMiss
20110000.45263.660%
25500000.04196.001%
302500000.00399.749%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.255
50000500000020.209


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-02T00:00:00ANONYMOUSv4_computers24A4525BAB321A040.222


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-23T05:40:20Oliver KruseGTX-2
29294220601653654060487
ED8D038A15DA7F__no
2017-12-08T00:05:29kkmrkkblmbrbkc4.xlarge
29294220601653654060487
ED8D038A15DA7F__no


P-1 factor-bounds graph:
B1 = 153065, B2 = 2783000 (P-1 stage 2)
B1 = 115000, B2 = 2530000 (P-1 stage 2)
B1 = 153065 (P-1 stage 1)
B1 = 115000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 161250 (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: 2017-12-08T00:05:29+00:00