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A127465
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Triangle read by rows: T(n,k) = k*phi(n/k) if k|n, T(n,k)=0 otherwise.
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1
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1, 1, 2, 2, 0, 3, 2, 2, 0, 4, 4, 0, 0, 0, 5, 2, 4, 3, 0, 0, 6, 6, 0, 0, 0, 0, 0, 7, 4, 4, 0, 4, 0, 0, 0, 8, 6, 0, 6, 0, 0, 0, 0, 0, 9, 4, 8, 0, 0, 5, 0, 0, 0, 0, 10, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 4, 4, 6, 8, 0, 6, 0, 0, 0, 0, 0, 12
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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First few rows of the triangle are:
1;
1, 2;
2, 0, 3;
2, 2, 0, 4;
4, 0, 0, 0, 5;
2, 4, 3, 0, 0, 6;
6, 0, 0, 0, 0, 0, 7;
4, 4, 0, 4, 0, 0, 0, 8;
...
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MAPLE
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if n mod k = 0 then
k*numtheory[phi](n/k) ;
else
0;
end if;
end proc:
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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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