is 2 2467961 - 1
has 742931 decimal digits
takes 0.171 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBE92A6BB44997475double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.039967.1642%2000000600000000.51907.6371%12.558869.6719%2.5077%
PrimeNet2590.031162.7119%100001800000.00192.5317%0.033163.6559%0.9440%
GPU722630.646765.0794%100001600000.00181.3354%0.648565.5457%0.4663%
Difference+4+11.3932+2.0848%+1990000+59840000+0.5171+6.3017%+11.9103+4.1262%+4.1262%

Known prime factors (1 factor, 81.4 bits, 0.00329998% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
246796132853844251125694257877592581.442665607038586219439
829 × 241337 × 3326897843
2015-07-142413373326897843351,30118.25334.048

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_computers15000232500---0.003--0.922%
2010-11-19T22:14:00Jocelyn LaroucheManual testing2000020000---0.002--0.313%
2010-11-27T12:43:00Jocelyn LaroucheManual testing246796246796---0.025--1.520%
2013-10-22T23:19:00David Campeaui5-2500k59000015930000---0.143--5.413%
2018-09-28T17:01:33alpertronManual testing20000006000000012---0.519--7.637%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:52:59LordJuliusManual testing21260--0.062--
2009-01-14T00:18:00Sturle Sundegiacco.ifi260261--0.062--
2012-06-08T11:43:00Sebastian HornbostelManual testing261262--0.124--
2013-02-21T00:57:00dbaughManual testing262263--0.398--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.796--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.514--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.193 GHz-days
Estimated T-Level:0.650
DigitsB1CurvesCompleteFacMiss
201100013 / 1000.13087.752%
255000013 / 2800.04695.455%

New Calculation Method

Total ECM effort:1.193 GHz-days
Estimated T-Level:0.650
DigitsB1CompleteFacMiss
20110000.41965.747%
25500000.03896.281%
302500000.00299.767%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.101
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersBE92A6BB449974750.171


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T10:11:54kkmrkkblmbrbkc4.xlarge858EE978C43CF9__no
2017-11-05T13:18:59Oliver KruseGTX-3
3285384425112569425787759
858EE978C43CF9__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 590000, B2 = 15930000 (P-1 stage 2)
B1 = 590000 (P-1 stage 1)
B1 = 246796 (P-1 stage 1)
B1 = 15000, B2 = 232500 (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
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2022-03-10T05:52:59+00:00