is 2 42862691 - 1
has 12902956 decimal digits
takes 63.178 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
Actual2681.390661.7647%----1.390661.7647%
Target27222.311663.8889%300000720000008.99013.8787%31.301765.2895%
Difference-4-20.9210-2.1242%-300000-72000000-8.9901-3.8787%-29.9111-3.5248%

Known prime factors (1 factor, 62.8 bits, 0.00014660% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
4286269182433856037461994631962.83896160383441
33 × 43 × 82825481		2007-03-3143828254810.03299.64518.013

P-1 results:
No P-1 results for M42862691


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2007-07-04ComputerraRUv4_computers21250--3.49932e-6--
2007-07-04ComputerraRUv4_computers250251--3.49932e-6--
2007-07-04ComputerraRUv4_computers251252--6.99865e-6--
2007-07-04ComputerraRUv4_computers252253--1.39973e-5--
2007-07-04ComputerraRUv4_computers253254--2.79946e-5--
2007-07-04ComputerraRUv4_computers254255--5.59892e-5--
2007-07-04ComputerraRUv4_computers255256--0.000--
2007-07-04ComputerraRUv4_computers256257--0.000--
2007-07-04ComputerraRUv4_computers257258--0.000--
2007-07-04ComputerraRUv4_computers258259--0.001--
2007-07-04ComputerraRUv4_computers259260--0.002--
2007-07-04ComputerraRUv4_computers260261--0.004--
2007-07-04ComputerraRUv4_computers261262--0.007--
2007-07-04ComputerraRUv4_computers262263
skipped known factors(?)
--0.023--
2007-07-04ComputerraRUv4_computers263264--0.046--
2007-07-04ComputerraRUv4_computers264265--0.087--
2007-07-04ComputerraRUv4_computers265266--0.174--
2007-07-04ComputerraRUv4_computers266267--0.349--
2007-07-04ComputerraRUv4_computers268268--0.697--
2022-06-26LordJuliusManual testing267268--0.697--


ECM factoring results:
No ECM results for M42862691


Lucas-Lehmer results:
No L-L results for M42862691


PRP results:
No PRP results for M42862691


P-1 factor-bounds graph:
100
101
102
100
101
102
103
104
105
106
107
108
TF factor-bounds graph:
268
267
266
265
264
263
262
261
260
259
258
257
256
255
254
253
252
251
250
this exponent TF target: 72
TF double-checked to: 67.8
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00