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Search: id:A159905
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| 1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 4, 4, 3, 2, 1, 2, 2, 3, 3, 2, 1, 6, 6, 5, 4, 3, 2, 1, 4, 4, 4, 4, 4, 3, 2, 1, 6, 6, 6, 6, 5, 4, 3, 2, 1, 4, 4, 5, 5, 5, 5, 4, 3, 2, 1, 10, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 4, 4, 4, 5, 6, 6, 6, 5, 4, 3, 2, 1
(list; table; graph; listen)
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OFFSET
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1,4
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COMMENT
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Row sums = A007438, Mobius transform of the triangular numbers.
Left border = phi(n), A000010.
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FORMULA
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Triangle read by rows, A054525 * A004736. A054525 = the Mobius transform, A004736 = the natural number "decrescendo" triangle: (1; 2,1; 3,2,1;...)
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EXAMPLE
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First few rows of the triangle =
1;
1, 1;
2, 2, 1;
2, 2, 2, 1;
4, 4, 3, 2, 1;
2, 2, 3, 3, 2, 1;
6, 6, 5, 4, 3, 2, 1;
4, 4, 4, 4, 4, 3, 2, 1;
6, 6, 6, 6, 5, 4, 3, 2, 1;
4, 4, 5, 5, 5, 5, 4, 3, 2, 1;
...
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CROSSREFS
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Cf. A007438
Adjacent sequences: A159902 A159903 A159904 this_sequence A159906 A159907 A159908
Sequence in context: A116543 A107260 A116204 this_sequence A106054 A160242 A023568
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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), Apr 25 2009
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