is 2 2897173 - 1
has 872136 decimal digits
takes 0.224 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L04BA1DB38D9AC165double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26710.256267.1642%20000050000000.05173.8280%10.307968.4211%1.2569%
PrimeNet2590.026562.7119%130002400000.00283.0016%0.029363.8311%1.1192%
GPU722630.550965.0794%160003000000.00351.9087%0.554465.7459%0.6665%
Difference+4+9.7053+2.0848%+184000+4700000+0.0482+1.9193%+9.7535+2.6752%+2.6752%

Known prime factors (1 factor, 76.7 bits, 0.00264739% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
28971731227037312288019567834412476.70021176459125637640
23 × 3 × 5 × 11 × 43 × 137 × 2723268047
2015-12-2013727232680477,546.316.61631.035

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-02T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.303%
2009-08-13T12:59:00Carsten Kossendeydurandal15000168750---0.003--0.861%
2010-12-24T09:09:00Jocelyn LaroucheManual testing2000020000---0.002--0.325%
2011-02-22T05:44:00Carsten Kossendeymother2000005000000---0.052--3.828%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:24Mark RoseManual testing21260--0.053--
2009-02-12T21:54:00Sturle Sundeduma.ifi260261--0.053--
2012-01-10T09:21:00Grant McCrackenthumper261262--0.106--
2013-01-10T10:24:00dbaughManual testing262263--0.339--
2015-04-22T10:47:00VictordeHollanderManual testing263264--0.678--
2015-04-22T10:47:00VictordeHollanderManual testing264265--1.290--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.152 GHz-days
Estimated T-Level:0.550
DigitsB1CurvesCompleteFacMiss
201100011 / 1000.11089.534%
255000011 / 2800.03996.141%

New Calculation Method

Total ECM effort:1.152 GHz-days
Estimated T-Level:0.550
DigitsB1CompleteFacMiss
20110000.35570.129%
25500000.03296.844%
302500000.00299.803%


ECM Summary

B1B2factorcurvesGHz-days
50000500000090.943
50000500000020.210


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-12-01T00:00:00ANONYMOUSv4_computers04BA1DB38D9AC1650.224


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:31:08alpertronManual testing
122703731228801956783441
A7D36914E7B5BB__no
2017-11-16T23:08:35Oliver KruseThreadripper
122703731228801956783441
A7D36914E7B5BB__no


P-1 factor-bounds graph:
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 15000, B2 = 168750 (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)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
265
264
263
262
261
260
250
260
270
280
290
2100
Last modified: 2017-11-16T23:08:35+00:00