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Search: id:A130208
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| 1, 0, 3, 0, 0, 4, 0, 0, 0, 7, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 15
(list; table; graph; listen)
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OFFSET
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1,3
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COMMENT
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A130207 replaces Sigma(n) with phi(n), A000010. A130209 replaces Sigma(n) with d(n), A000005.
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FORMULA
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Infinite lower triangular matrix with A000203, Sigma(n), in the main diagonal and the rest zeros.
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EXAMPLE
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First few rows of the triangle are:
1;
0, 3;
0, 0, 4;
0, 0, 0, 7;
0, 0, 0, 0, 6;
0, 0, 0, 0, 0, 12;
...
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CROSSREFS
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Cf. A000203, A130207, A130209.
Sequence in context: A079209 A021773 A133109 this_sequence A108579 A143044 A127775
Adjacent sequences: A130205 A130206 A130207 this_sequence A130209 A130210 A130211
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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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