is 2 25456201 - 1
has 7663081 decimal digits
takes 21.815 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L6812373C290E0CC2double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27118.780464.7887%30000069000000.81963.8058%19.600066.1288%1.3401%
PrimeNet2660.580262.1212%12000045000000.44565.1684%1.025864.0789%1.9577%
GPU722709.386764.2857%18000055000000.58383.7417%9.970665.6220%1.3363%
Difference+1+9.3937+0.5030%+120000+1400000+0.2358+0.0641%+9.6295+0.5068%+0.0037%

Known prime factors (1 factor, 68.5 bits, 0.00026896% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
254562014081376519833528479292168.4688016468207164
22 × 157 × 419 × 30465577
2012-01-03419304655773.76682.06303.8521

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-08-20T00:00:00ANONYMOUSv4_computers3000006900000---0.820--3.806%
2004-10-10T00:00:00ANONYMOUSv4_computers3000006900000---0.820--3.806%
2004-11-03T00:00:00ANONYMOUSv4_computers3000006900000---0.820--3.806%
2012-01-03T11:38:00Carsten KossendeyManual testing30000069000002168.4680.82043.631.6393.806%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-09-30T00:00:00Mattv4_computers21258--0.002--
2001-11-03T00:00:00Mattv4_computers21258--0.002--
2004-07-02T00:00:00korvav4_computers21267--1.167--
2011-10-09T17:48:00DubslowManual testing267268--1.174--
2012-01-02T22:42:00Carsten KossendeyManual testing268271--16.44--


ECM factoring results:
No ECM results for M25456201


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-11-03T00:00:00ANONYMOUSv4_computers6812373C290E0CC221.81
2004-11-22T00:00:00ANONYMOUSv4_computers6812373C290E0CC221.81


PRP results:
No PRP results for M25456201


P-1 factor-bounds graph:
B1 = 300000, B2 = 6900000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
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101
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108
TF factor-bounds graph:
271
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267
258
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290
2100
Last modified: 2012-01-03T11:38:51+00:00