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A025610
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Numbers of form 2^i*6^j, with i, j >= 0; equivalently, numbers of the form 2^i*3^j with 0 <= j <= i.
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12
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1, 2, 4, 6, 8, 12, 16, 24, 32, 36, 48, 64, 72, 96, 128, 144, 192, 216, 256, 288, 384, 432, 512, 576, 768, 864, 1024, 1152, 1296, 1536, 1728, 2048, 2304, 2592, 3072, 3456, 4096, 4608, 5184, 6144, 6912, 7776, 8192, 9216, 10368, 12288, 13824, 15552, 16384, 18432
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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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a(n) ~ exp(sqrt(2*log(2)*log(6)*n)) / sqrt(12).
Sum_{k>=1} 1/a(k) = 12/5. (End)
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MATHEMATICA
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n = 10^6; Flatten[Table[2^i*6^j, {i, 0, Log2[n]}, {j, 0, Log[6, n/2^i]}]] // Sort (* Amiram Eldar, Sep 26 2020 *)
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PROG
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(PARI) list(lim)=my(v=List(), t); for(j=0, logint(lim\=1, 6), t=6^j; while(t<=lim, listput(v, t); t<<=1)); Set(v) \\ Charles R Greathouse IV, Dec 14 2016
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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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