is 2 2668247 - 1
has 803223 decimal digits
takes 0.206 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L9EC8FFEFB7E4C469double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.136167.1642%2000000600000000.57797.6983%11.714069.6920%2.5278%
PrimeNet2590.028862.7119%110002000000.00242.7078%0.031263.7215%1.0097%
GPU722630.598265.0794%130002200000.00271.6209%0.600965.6454%0.5660%
Difference+4+10.5380+2.0848%+1987000+59780000+0.5752+6.0774%+11.1131+4.0466%+4.0466%

Known prime factors (1 factor, 68.4 bits, 0.00256205% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
26682473792522002776476075672168.36271067671073489
3 × 17 × 103 × 53831 × 251323
2010-07-225383125132332.8570.00720.0123

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.296%
2003-11-28T00:00:00Team Prime Ribv4_computers15000213750---0.003--0.913%
2019-07-04T12:48:14alpertronManual testing20000006000000012-
skipped known factor: 379252200277647607567
--0.578--7.698%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-04-02T00:00:00ANONYMOUSv4_computers21259--0.029--
2022-03-11T04:28:53LordJuliusManual testing21260--0.058--
2009-01-31T08:29:00Sturle Sundeghirardelli.ifi260261--0.058--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.310 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.310 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.310


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computers9EC8FFEFB7E4C4690.206


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-18T15:46:39Oliver KruseGTX-3
379252200277647607567
64E75732ADC770__no
2017-12-03T14:12:51kkmrkkblmbrbkc4.xlarge
379252200277647607567
64E75732ADC770__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 15000, B2 = 213750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-11T04:28:53+00:00