is 2 27079891 - 1
has 8151860 decimal digits
takes 25.068 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5A42BCE5325C94D7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27117.654464.7887%25500012750000.41692.4994%18.071265.6688%0.8801%
PrimeNet2660.545462.1212%12000045000000.48145.2108%1.026764.0950%1.9738%
GPU722708.823964.2857%20000060000000.69263.9027%9.516565.6795%1.3938%
Difference+1+8.8305+0.5030%+55000-4725000-0.2757-1.4033%+8.5547-0.0107%-0.5137%

Known prime factors (1 factor, 67.7 bits, 0.00024987% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
270798912340768990070089710712167.6664321969002885
3 × 5 × 288131266859
2011-10-1952881312668591.280021,07139,355

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2005-10-18T00:00:00antkhv4_computers2550001275000---0.417--2.499%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-10-19T21:10:00Carsten KossendeyManual testing??67.666210.18351.100.373
2001-08-18T00:00:00Net_Forcev4_computers21256--0.000--
2002-08-31T00:00:00Jocelyn Larouchev4_computers21257--0.001--
2004-03-01T00:00:00ANONYMOUSv4_computers21262--0.023--
2005-01-10T00:00:00ANONYMOUSv4_computers21267--1.097--
2011-10-19T21:10:00Carsten KossendeyManual testing267271--16.56--


ECM factoring results:
No ECM results for M27079891


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2006-03-14T00:00:00ANONYMOUSv4_computers5A42BCE5325C94D725.07


PRP results:
No PRP results for M27079891


P-1 factor-bounds graph:
B1 = 255000, B2 = 1275000 (P-1 stage 2)
B1 = 255000 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2011-10-19T21:10:50+00:00