is 2 7972339 - 1
has 2399914 decimal digits
takes 2.082 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L553E5460F467272Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2673.727165.6716 %40000400000.01510.6740 %3.742365.9030 %
Target2673.727165.6716 %5500060000000.14352.5654 %3.870666.5523 %
Difference----15000-5960000-0.1283-1.8914 %-0.1283-0.6493 %

Known prime factors (1 factor, 65.3 bits, 0.00081955% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
7972339466170690680359142812065.3372923675791260
22 × 5 × 7 × 74149 × 281641
2012-06-26741492816411.71040.03240.0571

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-06-15ANONYMOUSv4_computers4000040000--0.0150.674%
2012-06-26firejuggler2065.3370.0670.000%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-04-30firejugglerMaison5000002650000027--0.713
2021-05-12firejugglerMaison5000002650000065--0.713


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1998-08-16ANONYMOUSv4_computers212610.019
1998-11-14ANONYMOUSv4_computers212630.123


ECM factoring results:
No ECM results for M7972339


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-10-29ANONYMOUSv4_computers553E5460F467272B2.082
2003-06-30Phantomasv4_computers553E5460F467272B2.082


PRP results:
dateuseridcompidcofactorsres64
2018-06-22axnskylake
46617069068035914281
5FE375B143059BEF
2019-12-15GANKA-AC
46617069068035914281
5FE375B143059BEF


CERT results:
No CERT results for M7972339


P-1 factor-bounds graph:
B1 = 40000 (P-1 stage 1)
103
104
105
103
104
105
106
TF factor-bounds graph:
263
261
this exponent TF target: 67
TF double-checked to: 67
250
260
270
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Last modified: 2024-03-13T02:15:48+00:00