is 2 26415451 - 1
has 7951844 decimal digits
takes 24.453 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDD5ADA7A46F6A868double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27118.098464.7887%27500025437500.53503.0196%18.633565.8520%1.0632%
PrimeNet2660.559162.1212%12000045000000.48145.1937%1.040564.0885%1.9673%
GPU722709.045964.2857%19000055000000.64333.7920%9.689265.6400%1.3543%
Difference+1+9.0526+0.5030%+85000-2956250-0.1083-0.7724%+8.9443+0.2120%-0.2911%

Known prime factors (1 factor, 68.2 bits, 0.00025818% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
264154513387116969072304325932168.1996411241983096
23 × 32 × 19 × 239 × 19609123
2012-02-09239196091234.41971.43432.6783

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2005-02-12T00:00:00ANONYMOUSv4_computers2750002543750---0.535--3.020%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2012-02-09T06:11:00Carsten KossendeyManual testing??68.199212.16349.874.412
2004-05-11T00:00:00markrv4_computers21262--0.023--
2004-09-02T00:00:00korvav4_computers21267--1.125--
2011-11-08T06:12:00Carsten KossendeyManual testing267268--1.132--
2012-02-09T06:11:00Carsten KossendeyManual testing268271--15.84--


ECM factoring results:
No ECM results for M26415451


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-09-22T00:00:00ANONYMOUSv4_computersDD5ADA7A46F6A86824.45


PRP results:
No PRP results for M26415451


P-1 factor-bounds graph:
B1 = 275000, B2 = 2543750 (P-1 stage 2)
B1 = 275000 (P-1 stage 1)
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105
106
101
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108
TF factor-bounds graph:
271
268
267
262
2
250
260
270
280
290
2100
Last modified: 2012-02-09T06:11:17+00:00