is 2 2970941 - 1
has 894343 decimal digits
takes 0.253 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA08567CDBDAD9785double-checked
PRPDFF4F0D61E2FA589verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26820.062667.6471%1000000200000000.25125.5482%20.313869.4421%1.7950%
PrimeNet2600.051763.3333%120002200000.00292.5106%0.054664.2539%0.9206%
GPU722641.198065.6250%120002000000.00271.3486%1.200866.0886%0.4636%
Difference+4+18.8646+2.0221%+988000+19800000+0.2484+4.1996%+19.1130+3.3535%+3.3535%

Known prime factors (1 factor, 71.7 bits, 0.00241468% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
297094139401354119146491224632271.739663112362701691
32 × 72 × 1503656151251
2020-10-17491503656151251256.7710,11018,883

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.247%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.146%
2010-10-28T03:32:00markrtiny950001995000---0.024--2.459%
2015-05-02T08:23:00VictordeHollanderManual testing100000020000000---0.251--5.548%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-06-26T00:00:00ANONYMOUSv4_computers21260--0.052--
1999-07-12T00:00:00ANONYMOUSv4_computers21260--0.052--
1999-08-16T00:00:00ANONYMOUSv4_computers21260--0.052--
2009-02-14T09:34:00Sturle Sundenouchcraft.ifi260261--0.052--
2011-11-28T18:28:00Sebastian HornbostelManual testing261262--0.103--
2013-01-07T13:49:00dbaughManual testing262263--0.330--
2015-04-29T14:58:00VictordeHollanderManual testing263264--0.661--
2015-04-29T14:58:00VictordeHollanderManual testing264265--1.258--
2016-02-28T22:17:40ramgeisManual testing265266--2.515--
2017-12-03T16:23:23Gordon SpenceManual testing266267--5.031--
2018-12-25T13:40:43chuenkitManual testing267268--10.06--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.594 GHz-days
Estimated T-Level:1.550
DigitsB1CurvesCompleteFacMiss
201100031 / 1000.31073.230%
255000031 / 2800.11189.502%

New Calculation Method

Total ECM effort:3.594 GHz-days
Estimated T-Level:1.550
DigitsB1CompleteFacMiss
20110001.00036.788%
25500000.09091.358%
302500000.00699.445%


ECM Summary

B1B2factorcurvesGHz-days
500005000000252.899
50000500000060.696


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-15T00:00:00jingfiredv4_computersA08567CDBDAD97850.253
2018-10-17T22:23:41kkmrkkblmbrbkoldA08567CDBDAD97850.253


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-18T15:18:38mrh.orgi
3940135411914649122463
DFF4F0D61E2FA589no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 95000, B2 = 1995000 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-10-18T15:18:38+00:00