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Search: id:A133933
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| A133933 |
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Numbers that are products of two earlier terms, a(1)=2, a(2)=3. |
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+0
2
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| 2, 3, 6, 12, 18, 24, 36, 48, 54, 72, 96, 108, 144, 162, 192, 216, 288, 324, 384, 432, 486, 576, 648, 768, 864, 972, 1152, 1296, 1458, 1536, 1728, 1944, 2304, 2592, 2916, 3072, 3456, 3888, 4374, 4608, 5184, 5832, 6144, 6912, 7776, 8748, 9216, 10368, 11664
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Subsequence of A003586, the 3-smooth numbers;
A007335 is a subsequence.
This is likely the same as A000423, because the products of the form a(i)a(j), i<j=n or i=j<n, are probably irrelevant in A000423. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 08 2008
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EXAMPLE
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a(6) = 24 = a(1)*a(4);
a(7) = 36 = a(1)*a(5) = a(2)*a(4).
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CROSSREFS
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Sequence in context: A032727 A093687 A000423 this_sequence A007335 A103070 A079708
Adjacent sequences: A133930 A133931 A133932 this_sequence A133934 A133935 A133936
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KEYWORD
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nonn
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 30 2007
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