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Search: id:A127527
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| A127527 |
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Triangle, left column = phi(n), right border = d(n), row sums = sigma(n). |
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+0
2
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| 1, 1, 2, 2, 0, 2, 2, 2, 0, 3, 4, 0, 0, 0, 2, 2, 4, 2, 0, 0, 4, 6, 0, 0, 0, 0, 0, 2, 4, 4, 0, 3, 0, 0, 0, 4, 6, 0, 4, 0, 0, 0, 0, 0, 3, 4, 8, 0, 0, 2, 0, 0, 0, 0, 4
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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Left column = phi(n), A000010; right border = d(n), A000005; row sums = sigma(n), A000203: (1, 3, 4, 7, 6, 12, 8,...).
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FORMULA
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A054523 * M, as infinite lower triangular matrices; M = d(n), A000005 (1, 2, 2, 3, 2, 4, 2,...) 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;
1, 2;
2, 0, 2;
2, 2, 0, 3;
4, 0, 0, 0, 2;
2, 4, 2, 0, 0, 4;
6, 0, 0, 0, 0, 0, 2;
4, 4, 0, 3, 0, 0, 0, 4;
...
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CROSSREFS
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Cf. A054523, A000005, A000010, A000203.
Sequence in context: A029321 A029310 A134131 this_sequence A080769 A099307 A072738
Adjacent sequences: A127524 A127525 A127526 this_sequence A127528 A127529 A127530
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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 17 2007
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