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Search: id:A143594
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| A143594 |
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Triangle read by rows, A051731 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's). |
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+0
2
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| 1, 2, 2, 2, 2, 2, 3, 4, 2, 2, 2, 2, 2, 2, 2, 4, 6, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 6, 4, 4, 2, 2, 2, 2, 3, 4, 4, 2, 2, 2, 2, 2, 2, 4, 6, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 6, 10, 8, 6, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2
(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 = d(n), A000005: (1, 2, 2, 3, 2, 4, 2,...).
Prime rows have all 2's.
Row sums = A129235: (1, 4, 6, 11, 10, 10,...).
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FORMULA
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Triangle read by rows, A051731 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's), i.e. (1; 1,2; 1,2,2;...), 1<=k<=n A051731 = the inverse Mobius transform.
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EXAMPLE
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First few rows of the triangle =
1;
2, 2;
2, 2, 2;
3, 4, 2, 2;
2, 2, 2, 2, 2;
4, 6, 4, 2, 2, 2;
2, 2, 2, 2, 2, 2, 2;
...
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CROSSREFS
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Cf. A129235, A000005, A051731.
Sequence in context: A071806 A025781 A018119 this_sequence A120502 A099480 A025783
Adjacent sequences: A143591 A143592 A143593 this_sequence A143595 A143596 A143597
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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 26 2008
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