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A178085
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Triangle t(n,m) = 1 - phi(n) + phi(m) + phi(n - m) read by rows, 0<=m<=n.
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1
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1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 0, 0, 0, 0, 1, 1, 4, 2, 3, 2, 4, 1, 1, -2, 0, -1, -1, 0, -2, 1, 1, 4, 0, 3, 1, 3, 0, 4, 1, 1, 0, 2, -1, 1, 1, -1, 2, 0, 1, 1, 4, 2, 5, 1, 5, 1, 5, 2, 4, 1
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OFFSET
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0,5
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COMMENTS
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phi(.) is Euler's totient A000010(.).
Row sums are 1, 2, 4, 4, 7, 2, 17, -4, 17, 6, 31,... = (n+1)*(1-phi(n))+2*A002088(n).
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LINKS
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FORMULA
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t(n,m) = t(n,n-m).
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EXAMPLE
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1;
1, 1;
1, 2, 1;
1, 1, 1, 1;
1, 2, 1, 2, 1;
1, 0, 0, 0, 0, 1;
1, 4, 2, 3, 2, 4, 1;
1, -2, 0, -1, -1, 0, -2, 1;
1, 4, 0, 3, 1, 3, 0, 4, 1;
1, 0, 2, -1, 1, 1, -1, 2, 0, 1;
1, 4, 2, 5, 1, 5, 1, 5, 2, 4, 1;
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MAPLE
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with(numtheory) ;
1-phi(n)+phi(m)+phi(n-m) ;
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MATHEMATICA
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t[n_, m_, q_] := 1 - EulerPhi[n + q] + (EulerPhi[m + q] + EulerPhi[n - m + q]) - EulerPhi[q];
Table[Flatten[Table[Table[t[n, m, q], {m, 0, n}], {n, 0, 10}]], {q, 0, 10}]
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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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