is 2 15517253 - 1
has 4671159 decimal digits
takes 7.782 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LCAC3A075AC79FBC5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual2671.914964.1791 %48000030847740012.552110.0234 %14.467067.7696 %
Target2697.693865.2174 %110000140000000.63033.1112 %8.324166.2995 %
Difference-2-5.7789-1.0383 %+370000+294477400+11.9218+6.9122%+6.1429+1.4700 %

Known prime factors (1 factor, 77.1 bits, 0.00049685% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
155172531616859982679621265490092477.0985209878264792168
23 × 3 × 11 × 107 × 67867 × 2717573
2016-04-276786727175733,043.30.15430.2011

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-05-05curtiscv4_computers235000235000--0.1711.556%
2016-04-27ThaManual testing30000060000001222477.0980.5044.255%
2023-07-15nordisweet16_30.8b14480000480000--0.3492.136%
2023-07-20nordisweet16_30.8b14480000308477400
skipped known factor: 161685998267962126549009
--15.238.468%


Trial Factoring results:
57585960616263646566676869
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2001-01-21Net_Forcev4_computers212580.002
2001-02-11Net_Forcev4_computers212590.002
2001-03-05ANONYMOUSv4_computers212650.241
2013-09-19David CampeauManual testing2652660.482
2013-12-28NesowaManual testing2662670.963


ECM factoring results:
No ECM results for M15517253


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-10-07curtiscv4_computersCAC3A075AC79FBC57.782
2005-12-24ANONYMOUSv4_computersCAC3A075AC79FBC57.782


PRP results:
dateuseridcompidcofactorsres64
2023-08-17LordJuliusi79700_ParaII
161685998267962126549009
3389C3BD26C74BA3


CERT results:
dateuseridcompid
2023-08-17curtiscwcm424--23l


P-1 factor-bounds graph:
B1 = 480000, B2 = 308477400 (P-1 stage 2)
B1 = 300000, B2 = 6000000 (P-1 stage 2)
B1 = 480000 (P-1 stage 1)
B1 = 300000 (P-1 stage 1)
B1 = 235000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
259
258
this exponent TF target: 69
TF double-checked to: 67
250
260
270
280
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Last modified: 2024-03-13T02:15:48+00:00