is 2 15106661 - 1
has 4547559 decimal digits
takes 7.576 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L0A224763DF8F7180double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27263.305466.6667 %36000096300000.62913.5264 %63.934567.8421 %
Target2697.902965.2174 %100000130000000.58382.9964 %8.486866.2596 %
Difference+3+55.4025+1.4493 %+260000-3370000+0.0453+0.5299%+55.4478+1.5825 %

Known prime factors (1 factor, 84.5 bits, 0.00055952% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15106661278247651151430689043878872684.525920943586247916363
3 × 11 × 1481 × 659689 × 28564379
2022-02-2365968928564379279,7241.58532.1138

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-03-16ANONYMOUSv4_computers1550001123750--0.1512.618%
2019-03-27USAFSS6917th_Scty_Sq360000963000012--0.6014.768%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2022-02-23ATHec2-P_110000002900000027P-12684.5252.094


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2000-12-31Net_Forcev4_computers212580.004
2001-04-21ANONYMOUSv4_computers212650.247
2014-05-14NesowaManual testing2652671.484
2016-11-18mikrManual testing2672681.979
2017-10-08ramgeisManual testing2682693.957
2021-06-27lycornManual testing2692707.915
2021-09-08SRBaseManual testing27027115.83
2021-10-09ANONYMOUSManual testing27127231.66


ECM factoring results:
Total ECM effort:0.728 GHz-days
Estimated T-Level:0.192
DigitsB1CompleteFacMiss
20110000.03896.227%
25500000.00499.645%


ECM Summary

B1B2factorcurvesGHz-days
50000500000010.728


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-07-27ANONYMOUSv4_computers0A224763DF8F71807.576
2002-09-22ANONYMOUSv4_computers350E466DA4D736157.576
2005-11-13BCGv4_computers0A224763DF8F71807.576


PRP results:
dateuseridcompidcofactorsres64
2023-06-01DobriSlowFury
27824765115143068904387887
93926351EE620E48


CERT results:
dateuseridcompid
2023-06-01Stef423700x


P-1 factor-bounds graph:
B1 = 1000000, B2 = 29000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 360000, B2 = 9630000 (P-1 stage 2)
B1 = 360000 (P-1 stage 1)
B1 = 155000, B2 = 1123750 (P-1 stage 2)
B1 = 155000 (P-1 stage 1)
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105
106
104
105
106
107
108
TF factor-bounds graph:
272
271
270
269
268
267
265
258
this exponent TF target: 69
TF double-checked to: 67
ECM T-Level=0.19 ~= -16-bit
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Last modified: 2024-03-13T02:15:48+00:00