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A218857
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Imaginary part of the arithmetic derivative for the triangle of Gaussian integers z = r + i*I.
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3
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0, 0, 0, 0, 0, -2, 0, 2, 1, 2, 0, -2, -1, 0, 0, 0, 1, 1, 1, 0, 0, 0, -1, -1, -1, -8, -2, 0, 2, 8, 3, 6, 3, 8, 2, 0, -2, -8, -3, -6, -3, -3, 0, 0, 0, 0, 3, 1, 1, 1, 1, 3, 0, 0, 0, 0, -3, -1, -1, -1, -1, -6, -3, -2, 1, 2, 3, 8, 4, 8, 4, 8, 4, 6, 3, 2, -1, -2, -3, -8, -4, -8, -4, -8, -4
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OFFSET
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0,6
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COMMENTS
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The real part is A218856, which has more information, including a plot. 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, 0, 0,
-2, 0, 2, 1, 2, 0, -2, -1,
0, 0, 0, 1, 1, 1, 0, 0, 0, -1, -1, -1,
-8, -2, 0, 2, 8, 3, 6, 3, 8, 2, 0, -2, -8, -3, -6, -3,
-3, 0, 0, 0, 0, 3, 1, 1, 1, 1, 3, 0, 0, 0, 0, -3, -1, -1, -1, -1,
-6, -3, -2, 1, 2, 3, 8, 4, 8, 4, 8, 4, 6, 3, 2, -1, -2, -3, -8, -4, -8, -4, -8, -4
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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]])]; Table[t = Join[Table[di[n - i + I*i], {i, 0, n}], Table[di[i - n + I*i], {i, n - 1, 0, -1}], Table[di[i - n - I*i], {i, 1, n}], Table[di[n - i - I*i], {i, n - 1, 1, -1}]]; Im[t], {n, 0, 6}]
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CROSSREFS
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KEYWORD
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sign,tabf
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AUTHOR
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STATUS
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approved
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