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Search: id:A143613
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| 1, 2, 0, 2, 2, 0, 3, 0, 3, 0, 2, 2, 3, 4, 0, 4, 2, 0, 0, 5, 0, 2, 2, 3, 4, 5, 6, 0, 4, 0, 6, 0, 5, 0, 7, 0, 3, 4, 0, 4, 5, 0, 7, 8, 0, 4, 2, 6, 4, 0, 0, 7, 0, 9, 0, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 6, 2, 3, 0, 10, 0, 7, 0, 0, 0, 11, 2, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
(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 border = d(n).
Row sums = A057661: (1, 2, 4, 6, 11, 11, 22, 22, 31,...).
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FORMULA
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Triangle read by rows, A051731 * A127368, 1<=k<=n. A051731 = the inverse Mobius transform. A127368 records the reduced residue system mod n, by rows.
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EXAMPLE
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First few rows of the triangle =
1;
2, 0;
2, 2, 0;
3, 0, 3, 0;
2, 2, 3, 4, 0;
4, 2, 0, 0, 5, 0;
2, 2, 3, 4, 5, 6, 0;
...
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CROSSREFS
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Cf. A127368, A051731, A057661, A000005.
Sequence in context: A029317 A127800 A035692 this_sequence A121363 A138021 A166065
Adjacent sequences: A143610 A143611 A143612 this_sequence A143614 A143615 A143616
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KEYWORD
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nonn,tabl
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 27 2008
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