is 2 2989087 - 1
has 899805 decimal digits
takes 0.254 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD0C389E5E50685A0double-checked
PRP573873578CDE5B5Everified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26939.940968.1159%3000000900000000.95527.2673%40.896170.4330%2.3171%
PrimeNet2600.051463.3333%120002200000.00292.5134%0.054364.2549%0.9216%
GPU722641.190865.6250%130002000000.00291.3859%1.193666.1014%0.4764%
Difference+5+38.7501+2.4909%+2987000+89800000+0.9523+5.8814%+39.7025+4.3316%+4.3316%

Known prime factors (1 factor, 71.4 bits, 0.00239031% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
298908732220019401034162107592271.448538960883390717
538960883390717
2021-06-051538960883390717179.233,623,8536,768,349

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.199%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.120%
2010-10-22T22:08:00markrtiny1000002025000---0.025--2.214%
2016-06-22T02:55:59Jocelyn LaroucheManual testing19840040500006---0.050--2.953%
2017-07-10T01:11:32Jocelyn Larouchelow 4M39680039680006---0.073--3.242%
2019-11-08T18:42:57BigBrotherWinston30000009000000012---0.955--7.267%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21260--0.051--
2009-02-13T19:58:00Sturle Sundeothello.ifi260261--0.051--
2011-11-25T16:47:00Sebastian HornbostelManual testing261262--0.103--
2013-01-07T13:51:00dbaughManual testing262263--0.328--
2015-02-06T00:11:00lycornManual testing263264--0.657--
2015-02-06T00:12:00lycornManual testing264265--1.250--
2016-02-29T09:29:40ramgeisManual testing265266--2.500--
2017-12-07T01:23:26Gordon SpenceManual testing266267--5.000--
2018-12-28T09:55:51chuenkitManual testing267268--10.00--
2021-04-21T11:48:45TJAOIManual testing268269--20.00--


ECM factoring results:

Old Calculation Method

Total ECM effort:8.597 GHz-days
Estimated T-Level:3.650
DigitsB1CurvesCompleteFacMiss
201100073 / 1000.73048.014%
255000073 / 2800.26177.014%

New Calculation Method

Total ECM effort:8.597 GHz-days
Estimated T-Level:3.650
DigitsB1CompleteFacMiss
20110002.3709.344%
25500000.21580.689%
302500000.01398.687%


ECM Summary

B1B2factorcurvesGHz-days
500005000000606.964
50000500000060.696
50000675000070.937


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-30T00:00:00ANONYMOUSv4_computersD0C389E5E50685A00.254
2018-10-22T01:45:07kkmrkkblmbrbkoldD0C389E5E50685A00.254


PRP results:
dateuseridcompidcofactorsres64PRP
2021-06-06T17:13:50kutensvega
3222001940103416210759
573873578CDE5B5Eno


P-1 factor-bounds graph:
B1 = 3000000, B2 = 90000000 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 396800, B2 = 3968000 (P-1 stage 2)
B1 = 198400, B2 = 4050000 (P-1 stage 2)
B1 = 396800 (P-1 stage 1)
B1 = 100000, B2 = 2025000 (P-1 stage 2)
B1 = 198400 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-06-06T17:13:50+00:00