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Search: id:A130209
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| 1, 0, 2, 0, 0, 2, 0, 0, 0, 3, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 4
(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 d(n) with phi(n), A000010. A130208 replaces d(n) with Sigma(n), A000203.
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FORMULA
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Infinite lower triangular matrix with d(n), A000005, 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, 2;
0, 0, 2;
0, 0, 0, 3;
0, 0, 0, 0, 2;
0, 0, 0, 0, 0, 4;
...
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CROSSREFS
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Cf. A000005, A130207, A130209.
Sequence in context: A066448 A108497 A108498 this_sequence A109127 A002284 A016424
Adjacent sequences: A130206 A130207 A130208 this_sequence A130210 A130211 A130212
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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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