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A047886
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Triangle read by rows: T(n,k) = pi(n+k) - pi(n) - pi(k), where pi() = A000720 (n >= 0, 0 <= k <= n).
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7
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0, 0, 1, 0, 1, 0, 0, 0, 0, -1, 0, 1, 0, 0, 0, 0, 0, 0, -1, -1, -2, 0, 1, 0, -1, -1, -1, -1, 0, 0, -1, -2, -1, -2, -1, -2, 0, 0, -1, -1, -1, -1, -1, -2, -2, 0, 0, 0, -1, 0, -1, -1, -2, -1, -1, 0, 1, 0, 0, 0, -1, -1, -1, -1, 0, 0, 0, 0, 0, -1, -1, -2, -1, -2, -1, -1, -1, -2, 0, 1, 0, -1
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table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,21
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COMMENTS
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LINKS
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EXAMPLE
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Triangle begins
0;
0, 1;
0, 1, 0;
0, 0, 0, -1;
0, 1, 0, 0, 0;
0, 0, 0, -1, -1, -2;
...
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MATHEMATICA
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Flatten[Table[PrimePi[n+k]-PrimePi[n]-PrimePi[k], {n, 0, 20}, {k, 0, n}]] (* Harvey P. Dale, Feb 22 2012 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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