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A120435
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Triangle read by rows: T(n,k) = lcm(1,2,3,4,...,n)/k (1 <= k <= n).
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0
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1, 2, 1, 6, 3, 2, 12, 6, 4, 3, 60, 30, 20, 15, 12, 60, 30, 20, 15, 12, 10, 420, 210, 140, 105, 84, 70, 60, 840, 420, 280, 210, 168, 140, 120, 105, 2520, 1260, 840, 630, 504, 420, 360, 315, 280, 2520, 1260, 840, 630, 504, 420, 360, 315, 280, 252, 27720, 13860, 9240
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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Triangle starts:
1;
2, 1;
6, 3, 2;
12, 6, 4, 3;
60, 30, 20, 15, 12;
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MAPLE
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T:=proc(n, k) if k<=n then lcm(seq(j, j=1..n))/k else 0 fi end: for n from 1 to 11 do seq(T(n, k), k=1..n) od; # yields sequence in triangular form); # Emeric Deutsch, Jul 24 2006
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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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