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Search: id:A127478
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| 1, 2, 1, 3, 0, 2, 4, 2, 0, 2, 5, 0, 0, 0, 4, 6, 3, 4, 0, 0, 2, 7, 0, 0, 0, 0, 0, 6, 8, 4, 0, 4, 0, 0, 0, 4, 9, 0, 6, 0, 0, 0, 0, 0, 6, 10, 5, 0, 0, 8, 0, 0, 0, 0, 4
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Row sums = A018804: (1, 3, 5, 8, 9, 15, 13,...); right border = phi(n), A000010. A127477 = A054522 * A054523
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FORMULA
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A054523 * A054522 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 1;
3, 0, 2;
4, 2, 0, 2;
5, 0, 0, 0, 4;
6, 3, 4, 0, 0, 2;
7, 0, 0, 0, 0, 0, 6;
8, 4, 0, 4, 0, 0, 0, 4;
...
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CROSSREFS
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Cf. A054522, A054523, A018804, A000010.
Sequence in context: A025649 A025642 A025643 this_sequence A127472 A004563 A098035
Adjacent sequences: A127475 A127476 A127477 this_sequence A127479 A127480 A127481
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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 15 2007
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