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Search: id:A130207
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| 1, 0, 1, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 4
(list; table; graph; listen)
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OFFSET
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1,6
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COMMENT
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A130208 replaces phi(n) with Sigma(n), A000203. A130209 replaces phi(n) with d(n), A000005.
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FORMULA
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Infinite lower triangular matrix with A000010, phi(n), as the right diagonal and the rest zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
0, 1;
0, 0, 2;
0, 0, 0, 2;
0, 0, 0, 0, 4;
...
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CROSSREFS
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Cf. A000010, A130208, A130209.
Sequence in context: A079100 A123262 A070202 this_sequence A167688 A083914 A083891
Adjacent sequences: A130204 A130205 A130206 this_sequence A130208 A130209 A130210
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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), May 16 2007
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