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Search: id:A127574
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| A127574 |
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Triangle, left column = sigma(n), right border = n*sigma(n), row sums = sigma(n)^2. |
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+0
1
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| 1, 3, 6, 4, 0, 12, 7, 14, 0, 28, 6, 0, 0, 0, 30, 12, 24, 36, 0, 0, 72, 8, 0, 0, 0, 0, 0, 56, 15, 30, 0, 60, 0, 0, 0, 120
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Left column = sigma(n), A000203; right border = n*sigma(n), A064987; row sums = sigma(n)^2, A072861: (1, 9, 16, 49, 36, 144,...). A127573 = A127093 * M
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FORMULA
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M * A127093, where M = an infinite lower triangular matrix with sigma(n) in the main diagonal and the rest zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 6;
4, 0, 12;
7, 14, 0, 28;
6, 0, 0, 0, 30;
12, 24, 36, 0, 0, 72;
...
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CROSSREFS
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Cf. A127093, A127573, A064987, A000203.
Adjacent sequences: A127571 A127572 A127573 this_sequence A127575 A127576 A127577
Sequence in context: A120910 A109044 A085881 this_sequence A021737 A011307 A140072
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KEYWORD
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nonn,tabl,uned
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 19 2007
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