is 2 64203259 - 1
has 19327107 decimal digits
takes 155.737 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-L28EFCF3D8082FD__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27459.589964.8649%575000115000004.11603.8278%63.705966.2098%1.3449%
PrimeNet2703.721862.8571%280000120000003.23075.2157%6.952564.7944%1.9372%
GPU7227459.589964.8649%400000140000004.01313.7924%63.603066.1973%1.3325%
Difference---+175000-2500000+0.1029+0.0353%+0.1029+0.0124%+0.0124%

Known prime factors:
No known factors for M64203259

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2013-10-27T11:12:00TheJudgerManual testing57500011500000---4.116--3.828%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-08-25T00:00:00ANONYMOUSv4_computers21259--0.001--
2004-01-18T00:00:00AxelFoxv4_computers21260--0.002--
2016-02-23T17:19:07Mark RoseManual testing260263--0.022--
2016-02-23T17:19:08Mark RoseManual testing260263--0.022--
2009-03-08T21:06:00driveByUpgradesmcc_old_dell263264--0.031--
2009-03-11T03:36:00arnaudSRV-140264265--0.058--
2009-03-18T02:46:00ANONYMOUS265266--0.116--
2009-03-22T08:42:00_^MvIiIaX^_M8AX-P3-800M266267--0.233--
2009-09-29T22:12:00YanktonBarada267268--0.466--
2009-10-03T19:50:00YanktonBarada268269--0.931--
2012-05-19T13:08:00omiXorpLLB17-990-07269270--1.862--
2012-09-08T04:32:00SWL551Manual testing270271--3.725--
2012-09-08T05:32:00SWL551Manual testing271272--7.449--
2013-10-13T04:25:00LingUaanManual testing272273--14.90--
2013-10-19T00:42:00RichD0Manual testing273274--29.80--


ECM factoring results:
No ECM results for M64203259


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-04-04T02:24:00curtiscgrn229--16l28EFCF3D8082FD__155.7


PRP results:
No PRP results for M64203259


P-1 factor-bounds graph:
B1 = 575000, B2 = 11500000 (P-1 stage 2)
B1 = 575000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2016-02-23T17:19:08+00:00