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Search: id:A127481
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| A127481 |
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Triangle, left column = sigma(n), row sums = sigma_2(n). |
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+0
2
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| 1, 3, 2, 4, 0, 6, 7, 6, 0, 8, 6, 0, 0, 0, 20, 12, 8, 18, 0, 0, 12, 8, 0, 0, 0, 0, 0, 42, 15, 14, 0, 24, 0, 0, 0, 32, 13, 0, 24, 0, 0, 0, 0, 0, 54, 18, 12, 0, 0, 60, 0, 0, 0, 0, 40
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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Left column = sigma(n); row sums = sigma_2(n), A001157: (1, 5, 10, 21, 26, 50,...). Right border = n*phi(n), A002618.
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FORMULA
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A127093 * A054522 as infinite lower triangular matrices.
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EXAMPLE
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First few rows of the triangle are:
1;
3, 2;
4, 0, 6;
7, 6, 0, 8;
6, 0, 0, 0, 20,
12, 8, 18, 0, 0, 12;
8, 0, 0, 0, 0, 0, 42;
15, 14, 0, 24, 0, 0, 0, 32;
...
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CROSSREFS
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Cf. A054522, A127093, A001157, A002618, A000203, A127466.
Sequence in context: A129237 A127099 A004545 this_sequence A097673 A140430 A123359
Adjacent sequences: A127478 A127479 A127480 this_sequence A127482 A127483 A127484
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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 15 2007
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