is 2 2508619 - 1
has 755170 decimal digits
takes 0.174 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2CA8B424384A6651double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.844767.1642%32000001120000000.91808.7302%12.762770.0308%2.8666%
PrimeNet2590.030662.7119%110001900000.00212.6407%0.032763.6965%0.9847%
GPU722630.636265.0794%110001700000.00201.4084%0.638265.5712%0.4918%
Difference+4+11.2085+2.0848%+3189000+111830000+0.9160+7.3217%+12.1245+4.4596%+4.4596%

Known prime factors (1 factor, 78.1 bits, 0.00311470% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25086193320989663076589780986392478.13666191591131945301
11 × 617 × 3853 × 2531197091
2016-07-023853253119709143,63413.87025.905

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.291%
2003-10-31T00:00:00Team Prime Ribv4_computers15000236250---0.003--0.930%
2010-12-16T22:40:00Jocelyn LaroucheManual testing2000020000---0.002--0.314%
2011-01-01T00:57:00Jocelyn LaroucheManual testing3000030000---0.003--0.431%
2011-01-04T22:09:00Jocelyn LaroucheManual testing5000050000---0.005--0.618%
2011-10-03T05:18:00markrtiny1650003918750---0.037--3.460%
2016-02-12T12:50:00mikrMSI320000011200000012---0.918--8.730%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-08-16T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-02-07T00:52:00Sturle Sundebruch.ifi260261--0.061--
2012-06-12T15:42:00Sebastian HornbostelManual testing261262--0.122--
2013-01-23T08:30:00dbaughManual testing262263--0.391--
2015-02-18T11:36:00VictordeHollanderManual testing263264--0.783--
2015-02-18T11:36:00VictordeHollanderManual testing264265--1.489--
2015-11-04T09:56:26ramgeisManual testing265266--2.979--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.840 GHz-days
Estimated T-Level:1.000
DigitsB1CurvesCompleteFacMiss
201100020 / 1000.20081.791%
255000020 / 2800.07193.094%

New Calculation Method

Total ECM effort:1.840 GHz-days
Estimated T-Level:1.000
DigitsB1CompleteFacMiss
20110000.64552.458%
25500000.05894.336%
302500000.00499.642%


ECM Summary

B1B2factorcurvesGHz-days
500005000000181.656
50000500000020.184


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-06-15T00:00:00ANONYMOUSv4_computers2CA8B424384A66510.174


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T14:11:22kkmrkkblmbrbkc4.xlarge404116603C87BD__no
2017-11-07T22:16:04Oliver KruseGTX-0
332098966307658978098639
404116603C87BD__no


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 165000, B2 = 3918750 (P-1 stage 2)
B1 = 165000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 236250 (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
108
109
1010
TF factor-bounds graph:
267
266
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2017-11-07T22:16:04+00:00