is 2 27161881 - 1
has 8176541 decimal digits
takes 25.144 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBA2832EAC613BDECdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27117.601164.7887%32000066400000.89173.8409%18.492866.1412%1.3524%
PrimeNet2660.543762.1212%12000045000000.48145.2129%1.025164.0958%1.9746%
GPU722708.797364.2857%20000060000000.69263.9042%9.489965.6801%1.3944%
Difference+1+8.8038+0.5030%+120000+640000+0.1991-0.0633%+9.0029+0.4611%+0.4611%

Known prime factors (1 factor, 67.6 bits, 0.00024897% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
271618812277730618873090361592167.6264192880859159
3 × 1397626953053
2012-04-18313976269530531.6606102,208190,897

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2005-01-10T00:00:00curtiscv4_computers3200006640000---0.892--3.841%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2012-04-18T06:11:00Carsten KossendeyManual testing??67.626210.56751.251.155
2001-08-18T00:00:00Net_Forcev4_computers21256--0.000--
2004-03-26T00:00:00ANONYMOUSv4_computers21262--0.023--
2004-12-13T00:00:00Dmuchawiecv4_computers21267--1.094--
2012-04-18T06:11:00Carsten KossendeyManual testing267271--16.51--


ECM factoring results:
No ECM results for M27161881


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-02-02T00:00:00curtiscv4_computersBA2832EAC613BDEC25.14


PRP results:
No PRP results for M27161881


P-1 factor-bounds graph:
B1 = 320000, B2 = 6640000 (P-1 stage 2)
B1 = 320000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2012-04-18T06:11:36+00:00