is 2 253489961 - 1
has 76308082 decimal digits
takes 2,760.224 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2670.117258.2090%----0.117258.2090%0.0000%
PrimeNet27530.186262.6667%10000006500000070.84315.9643%101.029364.8933%2.2267%
GPU72279482.990364.5570%16000006500000079.80034.4157%562.790666.1220%1.5651%
Difference-12-482.8731-6.3480%-1600000-65000000-79.8003-4.4157%-562.6734-7.9131%-7.9131%

Known prime factors (2 factors, 133.4 bits, 0.00005263% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
253489961724835388196269483372065.974142971221688
23 × 3 × 17 × 41 × 601 × 14221		2013-11-09601142210.05470.02120.0228
2534899612001433225739288724312167.440394775638815
3 × 5 × 71 × 79 × 89 × 52721		2022-08-0389527210.17270.04670.0847

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
2534899611450709629127649194544666666511590059724741133.414
P-1 results:
No P-1 results for M253489961


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2013-11-09T01:31:00Andriy Makukhahome-i5??65.974200.0265,6560.053
2010-03-05T06:41:00Donna NobleRuth-Lappy262263--0.004--
2010-03-05T06:45:00Donna NobleRuth-Lappy263264--0.008--
2011-07-30T12:25:00sasaki3mate_ma2264265--0.015--
TF assumed completed to 67 but no detailed record exists
2022-08-03T11:17:03TJAOIManual testing267268*67.440210.0565,6560.114


ECM factoring results:
No ECM results for M253489961


Lucas-Lehmer results:
No L-L results for M253489961


PRP results:
No PRP results for M253489961


P-1 factor-bounds graph:
100
101
102
103
100
101
102
103
104
105
TF factor-bounds graph:
268
267
265
264
263
2
250
260
270
280
290
2100
Last modified: 2022-08-03T11:17:03+00:00