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A127570
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Triangle T(n,k) = sigma(k) if k|n, otherwise T(n,k)=0; 1 <= k <= n.
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0
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1, 1, 3, 1, 0, 4, 1, 3, 0, 7, 1, 0, 0, 0, 6, 1, 3, 4, 0, 0, 12, 1, 0, 0, 0, 0, 0, 8, 1, 3, 0, 7, 0, 0, 0, 15, 1, 0, 4, 0, 0, 0, 0, 0, 13, 1, 3, 0, 0, 6, 0, 0, 0, 0, 18, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 12, 1, 3, 4, 7, 0, 12, 0, 0, 0, 0, 0, 28, 1
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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First few rows of the triangle are:
1;
1, 3;
1, 0, 4;
1, 3, 0, 7;
1, 0, 0, 0, 6;
1, 3, 4, 0, 0, 12;
...
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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