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Search: id:A127449
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| A127449 |
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Triangle, row sums = n*phi(n). |
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+0
1
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| 1, 2, 0, 3, 3, 0, 4, 0, 4, 0, 5, 5, 5, 5, 0, 6, 0, 0, 0, 6, 0, 7, 7, 7, 7, 7, 7, 0, 8, 0, 8, 0, 8, 0, 8, 0, 9, 9, 0, 9, 9, 0, 9, 9, 0, 10, 0, 10, 0, 0, 0, 10, 0, 10, 0
(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 = n*phi(n), A002618: (1, 2, 6, 8, 20, 12, 42, 32,...)
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FORMULA
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By rows, n>1, replace the 1's of A054521 with n's.
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EXAMPLE
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First few rows of the triangle are:
1;
2, 0;
3, 3, 0;
4, 0, 4, 0;
5, 5, 5, 5, 0;
6, 0, 0, 0, 6, 0;
7, 7, 7, 7, 7, 7, 0;
...
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CROSSREFS
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Cf. A002618, A054521.
Sequence in context: A004557 A088276 A099838 this_sequence A138057 A053727 A127952
Adjacent sequences: A127446 A127447 A127448 this_sequence A127450 A127451 A127452
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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 14 2007
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