is 2 58271747 - 1
has 17541544 decimal digits
takes 123.504 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27465.655664.8649%20000004000000012.50905.4666%78.164566.7856%
Target27332.826364.3836%40000010400000018.57574.0797%51.401965.8366%
Difference+1+32.8293+0.4813%+1600000-64000000-6.0667+1.3869%+26.7626+0.9490%

Known prime factors (1 factor, 66.6 bits, 0.00011437% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
582717471155028965381746194332166.646991071166428
22 × 32 × 72 × 561831727		2015-01-25495618317270.379394.071175.70

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-10-22hustensaft245000245000---0.753--1.046%
2014-12-17VictordeHollanderManual testing200000040000000---12.51--5.467%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-12-23ANONYMOUSv4_computers21253--2.05919e-5--
2000-02-09ANONYMOUSv4_computers21254--4.11837e-5--
2000-06-28ANONYMOUSv4_computers21256--0.000--
2000-06-29ANONYMOUSv4_computers21256--0.000--
2001-07-17ANONYMOUSv4_computers21257--0.000--
2002-09-22ANONYMOUSv4_computers21258--0.001--
2003-07-30ANONYMOUSv4_computers21259--0.001--
2003-12-13ANONYMOUSv4_computers21261--0.005--
2022-06-27LordJuliusManual testing261263--0.022--
2008-10-29KYOJI_KAMEIC69F7CD4E263264--0.034--
2008-10-31KYOJI_KAMEIC69F7CD4E264265--0.064--
2008-11-03KYOJI_KAMEIwlaptop265266--0.128--
2008-11-03KYOJI_KAMEIwlaptop266267--0.256--
2015-01-25BloodIceManual testing266267*66.646210.126282.70.288
2009-06-01KonradWORK2267268--0.513--
2011-07-03hanssti7_860268269--1.026--
2011-12-30Craig MeyersManual testing269270--2.052--
2012-01-30Kyle AskineManual testing270271--4.104--
2012-05-04monstManual testing271272--8.207--
2012-09-18Kyle AskineManual testing272273--16.41--
2014-11-30monstManual testing273274--32.83--


ECM factoring results:
No ECM results for M58271747


Lucas-Lehmer results:
No L-L results for M58271747


PRP results:
No PRP results for M58271747


P-1 factor-bounds graph:
B1 = 2000000, B2 = 40000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 245000 (P-1 stage 1)
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TF factor-bounds graph:
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this exponent TF target: 73
TF double-checked to: 67.8
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Last modified: 2023-06-05T21:50:05+00:00