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A086420
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Euler's totient of 3-smooth numbers: a(n) = A000010(A003586(n)).
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1
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1, 1, 2, 2, 2, 4, 6, 4, 8, 6, 8, 18, 16, 12, 16, 18, 32, 24, 54, 32, 36, 64, 48, 54, 64, 72, 162, 128, 96, 108, 128, 144, 162, 256, 192, 216, 486, 256, 288, 324, 512, 384, 432, 486, 512, 576, 648, 1024, 1458, 768, 864, 972, 1024, 1152, 1296, 2048, 1458, 1536
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OFFSET
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1,3
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COMMENTS
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a(n) is 3-smooth.
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LINKS
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FORMULA
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MATHEMATICA
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s = {}; m = 12; Do[n = 3^k; While[n <= 3^m, AppendTo[s, n]; n*=2], {k, 0, m}]; EulerPhi /@ Union[s] (* Amiram Eldar, Jan 29 2020 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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