is 2 27161891 - 1
has 8176544 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-LD3AF01C4F495EC37double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27235.208765.2778%32000066400000.89173.4655%36.100466.4811%1.2033%
PrimeNet2660.543762.1212%12000045000000.48145.2129%1.025164.0958%1.9746%
GPU722708.797364.2857%20000060000000.69263.9042%9.489965.6801%1.3944%
Difference+2+26.4114+0.9921%+120000+640000+0.1991-0.4387%+26.6105+0.8010%+0.8010%

Known prime factors:
No known factors for M27161891

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2005-01-10T00:00:00compusionv4_computers3200006640000---0.892--3.465%
2005-02-02T00:00:00compusionv4_computers3200006640000---0.892--3.465%
2005-02-12T00:00:00compusionv4_computers3200006640000---0.892--3.465%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-18T00:00:00Net_Forcev4_computers21256--0.000--
2004-03-26T00:00:00ANONYMOUSv4_computers21262--0.023--
2004-12-23T00:00:00Primehackv4_computers21267--1.094--
2016-01-18T23:15:54NRManual testing267268--1.100--
2018-04-09T13:24:13VictordeHollanderManual testing268269--2.201--
2018-09-11T02:25:28chuenkitManual testing269270--4.402--
2021-02-20T05:50:13mikrManual testing270271--8.804--
2021-04-22T02:40:08Sid & AndyManual testing271272--17.61--


ECM factoring results:
No ECM results for M27161891


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-02-12T00:00:00compusionv4_computersD3AF01C4F495EC3725.14
2006-04-28T00:00:00ANONYMOUSv4_computersD3AF01C4F495EC3725.14


PRP results:
No PRP results for M27161891


P-1 factor-bounds graph:
B1 = 320000, B2 = 6640000 (P-1 stage 2)
B1 = 320000 (P-1 stage 1)
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107
TF factor-bounds graph:
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2100
Last modified: 2021-04-22T02:40:08+00:00