is 2 2486971 - 1
has 748653 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L139F8B63904478FFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.947867.1642%238250023825000.23963.7038%12.187568.3803%1.2162%
PrimeNet2590.030962.7119%100001800000.00192.5354%0.032863.6573%0.9454%
GPU722630.641865.0794%110001600000.00191.3806%0.643765.5615%0.4821%
Difference+4+11.3061+2.0848%+2371500+2222500+0.2377+2.3231%+11.5438+2.8189%+2.8189%

Known prime factors (1 factor, 88.8 bits, 0.00356925% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24869715264067417192417109018162392788.766105832907122608528789
3 × 71 × 307 × 9497 × 230597 × 739031
2014-11-1723059773903132,783,7980.02600.0472

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.290%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.919%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.314%
2011-01-22T13:27:00Oscar Östlin950001947500---0.020--2.680%
2014-09-03T20:52:00Jocelyn LaroucheManual testing120808120808---0.012--1.053%
2014-11-17T10:33:00mikrMSI238250023825002788.7660.2400.3450.4793.704%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:53:01LordJuliusManual testing21260--0.062--
2009-01-11T08:38:00Sturle Sundeginy.ifi260261--0.062--
2012-06-10T13:42:00Sebastian HornbostelManual testing261262--0.124--
2013-01-14T11:53:00dbaughManual testing262263--0.395--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.102 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

New Calculation Method

Total ECM effort:1.102 GHz-days
Estimated T-Level:0.600
DigitsB1CompleteFacMiss
20110000.38767.903%
25500000.03596.562%
302500000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.102


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computers139F8B63904478FF0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T06:26:08Oliver KruseGTX-07B52E17E522AC0__no
2017-11-29T20:03:31ATHec2-1xf
526406741719241710901816239
7B52E17E522AC0__no


P-1 factor-bounds graph:
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 120808 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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
TF factor-bounds graph:
267
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-10T05:53:01+00:00