is 2 25252603 - 1
has 7601791 decimal digits
takes 21.640 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L16E60E1D1DD2471Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27118.931864.7887%30000074250000.85513.8594%19.787066.1477%1.3589%
PrimeNet2660.584862.1212%11000040000000.40004.9842%0.984964.0092%1.8880%
GPU722709.462464.2857%18000055000000.58383.7377%10.046265.6206%1.3349%
Difference+1+9.4694+0.5030%+120000+1925000+0.2713+0.1217%+9.7407+0.5271%+0.5271%

Known prime factors (1 factor, 67.2 bits, 0.00026597% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
252526031652872959328387508892167.1643272678383548
22 × 3 × 7 × 1231 × 31649437
2011-10-141231316494371.75772.14414.0018

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-07-26T00:00:00Sturle Sundev4_computers3000007425000---0.855--3.859%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2011-10-14T03:11:00Carsten KossendeyManual testing??67.164210.58144.081.184
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2004-01-07T00:00:00markrv4_computers21262--0.024--
2004-04-20T00:00:00kevshawv4_computers21267--1.177--
2011-10-14T03:11:00Carsten KossendeyManual testing267271--17.76--


ECM factoring results:
No ECM results for M25252603


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-08-20T00:00:00Sturle Sundev4_computers16E60E1D1DD2471B21.64


PRP results:
No PRP results for M25252603


P-1 factor-bounds graph:
B1 = 300000, B2 = 7425000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
271
267
262
258
256
2
250
260
270
280
290
2100
Last modified: 2011-10-14T03:11:44+00:00