is 2 5075251 - 1
has 1527803 decimal digits
takes 0.703 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4D85227FA4A15C1Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2675.854765.6716%1500000450000000.77787.6746%6.632568.3062%2.6346%
PrimeNet2610.060562.2951%220005000000.00973.4067%0.070263.5796%1.2845%
GPU722651.437564.6154%340007000000.01412.4221%1.451665.4724%0.8570%
Difference+2+4.4172+1.0563%+1466000+44300000+0.7637+5.2525%+5.1809+2.8338%+2.8338%

Known prime factors (1 factor, 93.0 bits, 0.00183277% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
5075251100253269482890006095489509372993.018987668092503109758468
22 × 3 × 7 × 13 × 83 × 193 × 853 × 4129 × 16030943
2017-07-10412916030943589,268,7020.17630.3279

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-04-05T00:00:00Mezzov4_computers25000231250---0.007--1.247%
2009-08-15T22:05:00harleeP4_2600600001065000---0.023--2.361%
2017-07-10T10:44:03mikrS067150000045000000122993.0180.7781.4071.5567.675%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:39:08Mark RoseManual testing21261--0.061--
2008-12-28T21:05:00Sturle Sundebakeng.ifi261262--0.061--
2009-08-08T04:06:00GrunwalderGIMPManual testing21263--0.314--
2016-02-23T16:39:08Mark RoseManual testing262263--0.193--
2014-09-01T13:55:00krackerManual testing263264--0.387--
2014-09-15T10:35:00monstManual testing264265--0.736--
2015-08-02T21:34:00snme2pm1Manual testing265266--1.472--
2016-05-23T19:05:18Gordon SpenceManual testing266267--2.945--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.265 GHz-days
Estimated T-Level:0.300
DigitsB1CurvesCompleteFacMiss
20110006 / 1000.06094.148%
25500006 / 2800.02197.876%

New Calculation Method

Total ECM effort:1.265 GHz-days
Estimated T-Level:0.300
DigitsB1CompleteFacMiss
20110000.19482.403%
25500000.01798.266%
302500000.00199.892%


ECM Summary

B1B2factorcurvesGHz-days
50000500000061.265


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computers4D85227FA4A15C1E0.703
2000-04-12T00:00:00Mezzov4_computers4D85227FA4A15C1E0.703


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-28T13:09:32alpertronManual testing
10025326948289000609548950937
02244E2CD07253__no
2018-01-19T10:44:35kkmrkkblmbrbkc4.xlarge
10025326948289000609548950937
02244E2CD07253__no


P-1 factor-bounds graph:
B1 = 1500000, B2 = 45000000 (P-1 stage 2)
B1 = 1500000 (P-1 stage 1)
B1 = 60000, B2 = 1065000 (P-1 stage 2)
B1 = 60000 (P-1 stage 1)
B1 = 25000, B2 = 231250 (P-1 stage 2)
B1 = 25000 (P-1 stage 1)
102
103
104
105
106
107
102
103
104
105
106
107
108
TF factor-bounds graph:
267
266
265
264
263
262
261
250
260
270
280
290
2100
Last modified: 2018-01-19T10:44:35+00:00