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A327785
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Square array read by antidiagonals: A(n,k) = Sum_{d|n} (k/d), (n>=1, k>=0), where (m/n) is the Kronecker symbol.
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1
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1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 0, 0, 3, 1, 1, 1, 1, 1, 2, 1, 1, 0, 2, 1, 0, 4, 1, 1, 1, 0, 1, 0, 0, 2, 1, 1, 2, 1, 1, 2, 0, 2, 4, 1, 1, 1, 2, 1, 1, 2, 0, 1, 3, 1, 1, 2, 0, 3, 2, 0, 2, 0, 1, 4, 1, 1, 1, 1, 1, 0, 1, 0, 1, 1, 0, 2, 1, 1, 0, 2, 3, 0, 4, 0, 0, 3, 0, 0, 6, 1
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OFFSET
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1,5
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LINKS
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EXAMPLE
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Square array begins:
1, 1, 1, 1, 1, 1, 1, 1, ...
1, 2, 1, 0, 1, 0, 1, 2, ...
1, 2, 0, 1, 2, 0, 1, 2, ...
1, 3, 1, 1, 1, 1, 1, 3, ...
1, 2, 0, 0, 2, 1, 2, 0, ...
1, 4, 0, 0, 2, 0, 1, 4, ...
1, 2, 2, 0, 2, 0, 0, 1, ...
1, 4, 1, 0, 1, 0, 1, 4, ...
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MATHEMATICA
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A[n_, k_] := Sum[KroneckerSymbol[k, d], {d, Divisors[n]}];
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CROSSREFS
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Columns k=0..31 give A000012, A000005, A035185, A035186, A001227, A035187, A035188, A035189, A035185, A035191, A035192, A035193, A035194, A035195, A035196, A035197, A001227, A035199, A035200, A035201, A035202, A035203, A035204, A035205, A035188, A035207, A035208, A035186, A035210, A035211, A035212, A035213.
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KEYWORD
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AUTHOR
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STATUS
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approved
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