is 2 12942883 - 1
has 3896197 decimal digits
takes 5.287 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LED390DDD95918D23double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2672.295864.1791 %30000060000000.36165.0866 %2.657466.0012 %
Target2684.605264.7059 %90000120000000.43763.1668 %5.042965.8236 %
Difference-1-2.3095-0.5268 %+210000-6000000-0.0760+1.9198%-2.3855+0.1776 %

Known prime factors (1 factor, 67.6 bits, 0.00052238% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
129428832254135929690057242632167.6118708013236657
7 × 23 × 27791 × 1946207
2015-08-162779119462074.43380.07840.1173

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-12-22davidcrossv4_computers200000200000--0.1181.587%
2015-08-16ThaManual testing3000006000000622167.6110.4244.601%


Trial Factoring results:
575859606162636465666768
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-04-19lalerav4_computers212610.012
2000-04-27lalerav4_computers212620.024
2000-05-10ANONYMOUSv4_computers212640.152
2013-05-31lycornManual testing2642650.289
2014-05-12NesowaManual testing2652660.577
2015-04-16ThaManual testing2662671.155


ECM factoring results:
No ECM results for M12942883


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-07-14Architects Cubedv4_computersED390DDD95918D235.287
2002-07-27Architects Cubedv4_computersED390DDD95918D235.287
2004-10-03tofercv4_computersED390DDD95918D235.287


PRP results:
dateuseridcompidcofactorsres64
2022-05-25XZT3050Micro3
225413592969005724263
818382B237DC7855


CERT results:
dateuseridcompid
2022-05-25suichioffice


P-1 factor-bounds graph:
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 200000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
TF factor-bounds graph:
267
266
265
264
262
261
this exponent TF target: 68
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00