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A218854
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Real part of the arithmetic derivative for the triangle of Gaussian integers z = r + i*I, with r >= 0 and i >= 0.
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4
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0, 0, 0, 2, 1, 2, 1, 1, 1, 0, 8, 3, 6, 3, 8, 3, 1, 1, 1, 1, 3, 8, 4, 8, 4, 8, 4, 6, 1, 1, 1, 4, 4, 1, 1, 0, 24, 10, 14, 5, 20, 5, 14, 10, 24, 6, 4, 1, 5, 1, 1, 4, 1, 4, 0, 16, 6, 12, 6, 12, 11, 12, 6, 12, 6, 16, 1, 1, 5, 1, 5, 1, 1, 5, 1, 5, 1, 0, 28, 7, 20
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OFFSET
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0,4
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COMMENTS
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See A218856 for a two-dimensional plot of the derivatives. The imaginary part is in A218855. Consult A099379 for the arithmetic derivative of Gaussian integers.
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LINKS
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EXAMPLE
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Triangle:
0,
0, 0,
2, 1, 2,
1, 1, 1, 0,
8, 3, 6, 3, 8,
3, 1, 1, 1, 1, 3,
8, 4, 8, 4, 8, 4, 6,
1, 1, 1, 4, 4, 1, 1, 0
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MATHEMATICA
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di[0]=0; di[1]=0; di[ -1]=0; di[I]=0; di[ -I]=0; di[n_] := Module[{f, unt}, f=FactorInteger[n, GaussianIntegers->True]; unt=(Abs[f[[1, 1]]]==1); If[unt, f=Delete[f, 1]]; f=Transpose[f]; Plus@@(n*f[[2]]/f[[1]])]; Re[Table[di[n-i + I*i], {n, 0, 12}, {i, 0, n}]]
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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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