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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
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| T(n,1)=A003418(n). Row sums yield A025529. - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2006
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EXAMPLE
| Triangle starts:
1;
2,1;
6,3,2;
12,6,4,3;
60,30,20,15,12;
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MAPLE
| 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 (deutsch(AT)duke.poly.edu), Jul 24 2006
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CROSSREFS
| Cf. A003418, A094310.
Cf. A003418, A025529.
Sequence in context: A096334 A107867 A158442 * A125901 A094307 A097905
Adjacent sequences: A120432 A120433 A120434 * A120436 A120437 A120438
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KEYWORD
| nonn,tabl
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AUTHOR
| Leroy Quet Jul 15 2006
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 24 2006
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