is 2 2514157 - 1
has 756837 decimal digits
takes 0.174 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
Actual26711.818667.1642%2000000600000000.51907.6516%12.337669.6766%2.5125%
PrimeNet2590.030562.7119%110001900000.00212.6418%0.032663.6969%0.9851%
GPU722630.634865.0794%110001700000.00201.4091%0.636865.5714%0.4921%
Difference+4+11.1838+2.0848%+1989000+59830000+0.5170+6.2425%+11.7008+4.1052%+4.1052%

Known prime factors (2 factors, 118.4 bits, 0.00470964% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
251415749875192885191342.181991887
3 × 13 × 29 × 877
-298773.948e-77.563e-68.990e-6
2514157883927068757705754495992376.22617578995042030107
7 × 107 × 23469953327143
2018-03-091072346995332714310,339128,604240,197

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
251415744086033050731177978625921302385388136118.408
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2019-07-04T12:39:17alpertronManual testing20000006000000012-
skipped known factor: 4987519288519
--0.519--7.652%


Trial Factoring results:
No TF results for M2514157


ECM factoring results:

Old Calculation Method

Total ECM effort:0.368 GHz-days
Estimated T-Level:0.200
DigitsB1CurvesCompleteFacMiss
20110004 / 1000.04096.060%
25500004 / 2800.01498.579%

New Calculation Method

Total ECM effort:0.368 GHz-days
Estimated T-Level:0.200
DigitsB1CompleteFacMiss
20110000.15485.740%
25500000.01498.587%


ECM Summary

B1B2factorcurvesGHz-days
50000500000030.276
50000500000010.092


Lucas-Lehmer results:
No L-L results for M2514157


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T11:29:35Oliver KruseGTX-1BFA2EC287659F9__no
2017-12-01T10:55:10kkmrkkblmbrbkold
4987519288519
BFA2EC287659F9__no
2018-03-09T16:18:35ATHec2-1xd
4987519288519
88392706875770575449599
BFA2EC287659F9__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-07-04T12:39:17+00:00