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A025633
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Numbers of form 8^i*9^j, with i, j >= 0.
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5
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1, 8, 9, 64, 72, 81, 512, 576, 648, 729, 4096, 4608, 5184, 5832, 6561, 32768, 36864, 41472, 46656, 52488, 59049, 262144, 294912, 331776, 373248, 419904, 472392, 531441, 2097152, 2359296, 2654208, 2985984, 3359232, 3779136, 4251528, 4782969
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OFFSET
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1,2
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LINKS
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FORMULA
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Sum_{n>=1} 1/a(n) = (8*9)/((8-1)*(9-1)) = 9/7. - Amiram Eldar, Sep 25 2020
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MATHEMATICA
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n = 10^6; Flatten[Table[8^i*9^j, {i, 0, Log[8, n]}, {j, 0, Log[9, n/8^i]}]] // Sort (* Amiram Eldar, Sep 25 2020 *)
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PROG
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(PARI) list(lim)=my(v=List(), N); for(n=0, logint(lim\=1, 9), N=9^n; while(N<=lim, listput(v, N); N<<=3)); Set(v) \\ Charles R Greathouse IV, Jan 10 2018
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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