is 2 61506587 - 1
has 18515328 decimal digits
takes 144.484 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L83B0BB609BD8B02Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27462.202564.8649%580000107300003.85923.7576%66.061766.1851%1.3202%
PrimeNet2703.885062.8571%260000120000003.06435.1375%6.949264.7653%1.9082%
GPU7227462.202564.8649%400000130000003.70073.7180%65.903366.1712%1.3063%
Difference---+180000-2270000+0.1584+0.0396%+0.1584+0.0139%+0.0139%

Known prime factors:
No known factors for M61506587

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2013-04-19T08:09:00Massimo Cappelli (ik5pwa)maxwin7_VPN-PA58000010730000---3.859--3.758%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-06-06T00:00:00ANONYMOUSv4_computers21259--0.001--
2003-11-08T00:00:00ANONYMOUSv4_computers21260--0.002--
2004-04-09T00:00:00ANONYMOUSv4_computers21262--0.010--
2016-02-23T17:06:51Mark RoseManual testing262263--0.016--
2009-04-10T15:34:00cnaTb_xo4yManual testing263264--0.032--
2009-07-24T06:37:00unconnecteddual-E5335264265--0.061--
2009-07-25T10:43:00unconnecteddual-E5335265266--0.121--
2009-08-02T10:25:00curtiscwde2610-10l266267--0.243--
2009-10-20T21:06:00nailssspentium1-8ghzd267268--0.486--
2010-01-06T03:36:00arnaudSRV-140268269--0.972--
2011-11-16T11:14:00ANONYMOUS269270--1.944--
2012-09-06T01:21:00Clown_RoyalManual testing270271--3.888--
2013-02-06T12:52:00MikeBerlinManual testing271272--7.776--
2013-02-06T18:43:00MikeBerlinManual testing272273--15.55--
2014-07-12T02:07:00Craig MeyersManual testing273274--31.10--


ECM factoring results:
No ECM results for M61506587


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2014-08-18T00:53:00AJ Harringtonmadhouse83B0BB609BD8B02A144.5
2021-10-04T13:06:19-Anonymous-83B0BB609BD8B02A144.5


PRP results:
No PRP results for M61506587


P-1 factor-bounds graph:
B1 = 580000, B2 = 10730000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2021-10-04T13:06:19+00:00