is 2 2990381 - 1
has 900195 decimal digits
takes 0.255 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L0DA10D58C278A4C3double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2679.936567.1642%10000020250000.02532.8077%9.961868.0861%0.9219%
PrimeNet2600.051463.3333%120002200000.00292.5136%0.054264.2550%0.9217%
GPU722641.190365.6250%130002000000.00291.3860%1.193166.1015%0.4765%
Difference+3+8.7462+1.5392%+87000+1825000+0.0224+1.4216%+8.7687+1.9847%+1.9847%

Known prime factors (1 factor, 81.9 bits, 0.00273842% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
299038144784422782446090027763512581.889748807974342501675
3 × 52 × 7 × 1426300903509527
2016-01-13251426300903509527264,2659,590,13017,911,693

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.306%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.177%
2010-10-22T13:28:00markrtiny1000002025000---0.025--2.808%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-09T00:00:00ANONYMOUSv4_computers21260--0.051--
1999-09-30T00:00:00ANONYMOUSv4_computers21260--0.051--
2009-02-14T04:36:00Sturle Sundeothello.ifi260261--0.051--
2011-11-24T05:17:00Sebastian HornbostelManual testing261262--0.103--
2013-01-07T13:51:00dbaughManual testing262263--0.328--
2015-02-05T07:22:00lycornManual testing263264--0.657--
2015-02-05T07:23:00lycornManual testing264265--1.249--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.393 GHz-days
Estimated T-Level:0.600
DigitsB1CurvesCompleteFacMiss
201100012 / 1000.12088.638%
255000012 / 2800.04395.797%

New Calculation Method

Total ECM effort:1.393 GHz-days
Estimated T-Level:0.600
DigitsB1CompleteFacMiss
20110000.38767.903%
25500000.03596.562%
302500000.00299.785%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.045
50000500000030.348


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-11-10T00:00:00ANONYMOUSv4_computers0DA10D58C278A4C30.255


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:33:10alpertronManual testing
4478442278244609002776351
CA114C4BF20E5A__no
2017-11-18T04:24:33Oliver KruseGTX-2
4478442278244609002776351
CA114C4BF20E5A__no


P-1 factor-bounds graph:
B1 = 100000, B2 = 2025000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
100
101
102
103
104
105
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
1014
1015
1016
TF factor-bounds graph:
267
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2017-11-18T04:24:33+00:00