is 2 12125963 - 1
has 3650279 decimal digits
takes 4.668 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L096D8B8B062C6533double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27278.866666.6667 %6000003065309109.63986.5226 %88.506568.8409 %
Target2684.915564.7059 %80000100000000.34642.9457 %5.261965.7455 %
Difference+4+73.9511+1.9608 %+520000+296530910+9.2935+3.5769%+83.2446+3.0953 %

Known prime factors (1 factor, 75.8 bits, 0.00062503% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12125963653497239321238240698012375.7912694619962642300
22 × 3 × 52 × 7 × 11 × 23 × 37 × 137074283
2021-12-1437137074283631.044.16917.7867

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-04-29ANONYMOUSv4_computers1450002610000--0.1563.461%
2001-07-29ANONYMOUSv4_computers1400001925000--0.1323.209%
2021-12-14lycornsupernova60000030653091022375.79111.119.224%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-02-23ANONYMOUSv4_computers212640.162
2013-09-19lycornManual testing2642650.308
2013-09-30NesowaManual testing2652660.616
2015-02-12ThaManual testing2662671.233
2015-07-06ThaManual testing2672682.465
2017-11-03ramgeisManual testing2682694.930
2021-06-23ZacHFXManual testing26927129.58
2021-10-23ANONYMOUSManual testing27127239.44


ECM factoring results:
Total ECM effort:1.171 GHz-days
Estimated T-Level:0.385
DigitsB1CompleteFacMiss
20110000.07792.596%
25500000.00799.291%


ECM Summary

B1B2factorcurvesGHz-days
50000500000021.171


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2001-11-24ANONYMOUSv4_computers096D8B8B062C65334.669
2004-08-20ANONYMOUSv4_computers096D8B8B062C65334.669


PRP results:
dateuseridcompidcofactorsres64
2022-01-26Poaooffice-CN1
65349723932123824069801
33AF90A8998616FB


CERT results:
dateuseridcompid
2022-01-26KUNCEVO6E5-3000-GR


P-1 factor-bounds graph:
B1 = 600000, B2 = 306530910 (P-1 stage 2)
B1 = 600000 (P-1 stage 1)
B1 = 145000, B2 = 2610000 (P-1 stage 2)
B1 = 140000, B2 = 1925000 (P-1 stage 2)
B1 = 145000 (P-1 stage 1)
B1 = 140000 (P-1 stage 1)
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101
102
103
104
105
106
100
101
102
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105
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109
TF factor-bounds graph:
272
271
269
268
267
266
265
264
this exponent TF target: 68
TF double-checked to: 67
ECM T-Level=0.38 ~= -15-bit
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Last modified: 2024-03-13T02:15:48+00:00