is 2 26791651 - 1
has 8065091 decimal digits
takes 24.801 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF9007C2CDCB157FAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27117.844364.7887%27500025437500.53503.0254%18.379365.8540%1.0653%
PrimeNet2660.551262.1212%12000045000000.48145.2035%1.032664.0922%1.9710%
GPU722708.918864.2857%20000060000000.69263.8971%9.611565.6775%1.3918%
Difference+1+8.9255+0.5030%+75000-3456250-0.1576-0.8716%+8.7679+0.1765%-0.3265%

Known prime factors (1 factor, 67.8 bits, 0.00025298% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
267916512527642803494573008572167.7764717221054228
22 × 32 × 131033918173
2011-11-2291310339181731.36709,582.517,897

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2005-04-11T00:00:00ANONYMOUSv4_computers2750002543750---0.535--3.025%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-11-22T06:17:00Carsten KossendeyManual testing??67.776210.25850.560.526
2004-07-02T00:00:00markrv4_computers21262--0.023--
2004-09-02T00:00:00ANONYMOUSv4_computers21267--1.109--
2011-11-22T06:17:00Carsten KossendeyManual testing267271--16.74--


ECM factoring results:
No ECM results for M26791651


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-09-22T00:00:00ANONYMOUSv4_computersF9007C2CDCB157FA24.80


PRP results:
No PRP results for M26791651


P-1 factor-bounds graph:
B1 = 275000, B2 = 2543750 (P-1 stage 2)
B1 = 275000 (P-1 stage 1)
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TF factor-bounds graph:
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2
250
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Last modified: 2011-11-22T06:17:32+00:00