is 2 27371261 - 1
has 8239571 decimal digits
takes 25.337 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LF27BE0872C53A4B1double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27117.466464.7887 %15500032162500.43192.9499 %17.898465.8274 %
Target2708.730064.2857 %200000300000002.44773.9082 %11.177765.6815 %
Difference+1+8.7365+0.5030 %-45000-26783750-2.0158-0.9583 %+6.7206+0.1459 %

Known prime factors (1 factor, 68.0 bits, 0.00024828% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
273712612864816064183423925992167.9575233255537959
32 × 581472837551
2011-11-1395814728375512.101842,52379,421

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2007-10-17Mr. P-1v4_computers1550003216250--0.4323.295%


Trial Factoring results:
575859606162636465666768697071
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2011-11-13Carsten KossendeyManual testing??
67.957
21
2.131
2001-08-24Net_Forcev4_computers212560.000
2004-04-29ANONYMOUSv4_computers212610.006
2004-08-20ANONYMOUSv4_computers212620.011
2005-01-10JC_Herlesv4_computers212670.546
2011-11-13Carsten KossendeyManual testing26727116.38


ECM factoring results:
No ECM results for M27371261


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-11-13ANONYMOUSv4_computersF27BE0872C53A4B125.34


PRP results:
No PRP results for M27371261


CERT results:
No CERT results for M27371261


P-1 factor-bounds graph:
B1 = 155000, B2 = 3216250 (P-1 stage 2)
B1 = 155000 (P-1 stage 1)
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1010
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TF factor-bounds graph:
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this exponent TF target: 70
TF double-checked to: 67
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Last modified: 2024-03-13T02:15:48+00:00